AT&T BROADBAND LLC
8-K, 2000-03-10
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>   1


                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                               ------------------

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

                         Date of Report: March 10, 2000
               Date of Earliest Event Reported: February 25, 2000

                               AT&T BROADBAND, LLC
                  (FORMERLY KNOWN AS TELE-COMMUNICATIONS, INC.)
             (Exact Name of Registrant as Specified in its Charter)

                                    DELAWARE
                 (State or Other Jurisdiction of Incorporation)

          0-20421                                        84-1260157
(Commission File Number)                    (I.R.S. Employer Identification No.)


                            9197 SOUTH PEORIA STREET
                            ENGLEWOOD, COLORADO 80112
          (Address of principal executive offices, including zip code)

       Registrant's telephone number, including area code: (720) 875-5500

                            TELE-COMMUNICATIONS, INC.
         (Former name or former address, if changed, since last report)






<PAGE>   2

ITEM 5. OTHER EVENTS.

         On March 10, 2000, Tele-Communications, Inc., a Delaware corporation
(the "Company"), converted into a Delaware limited liability company pursuant to
Section 266 of the Delaware General Corporation Law and Section 18-214 of the
Delaware Limited Liability Company Act (the "Conversion"). In accordance with
applicable law, the Conversion did not affect any obligations or liabilities of
the Company incurred prior to the Conversion (including those with respect to
the Securities (defined below)). Upon the Conversion the Company changed its
name to "AT&T Broadband, LLC". AT&T Corp. is the sole member of the Company. A
copy of the certificate of conversion to limited liability company of the
Company to AT&T Broadband, LLC is filed as Exhibit 2.1 to this Current Report on
Form 8-K and is incorporated by reference herein. A copy of the certificate of
formation of AT&T Broadband, LLC is filed as Exhibit 2.2 to this Current Report
on Form 8-K and is incorporated by reference herein.

         Prior to the Conversion, the Company and The Bank of New York ("BONY"),
as trustee, entered into the following supplemental indentures:

                  (1) the Second Supplemental Indenture, dated as of February
         25, 2000 ("Supplemental Indenture A"), to the Indenture, dated as of
         April 1, 1991, as supplemented by the First Supplemental Indenture,
         dated as of March 9, 1999 (collectively, "Indenture A"), between the
         Company (as successor issuer) and BONY, as successor trustee;

                  (2) the First Supplemental Indenture, dated as of February 25,
         2000 ("Supplemental Indenture B"), to the Indenture, dated as of August
         9, 1991 ("Indenture B"), between the Company (as successor issuer) and
         BONY;

                  (3) the Third Supplemental Indenture, dated as of February 25,
         2000 ("Supplemental Indenture C"), to the Indenture, dated as of August
         4, 1993, as supplemented by the First Supplemental Indenture, dated as
         of September 13, 1994, and the Second Supplemental Indenture, dated as
         of March 9, 1999 (collectively, "Indenture C"), between the Company (as
         successor issuer) and BONY;

                  (4) the Second Supplemental Indenture, dated as of February
         25, 2000 ("Supplemental Indenture D"), to the Indenture, dated as of
         December 20, 1995, as supplemented by the First Supplemental Indenture,
         dated as of March 9, 1999 (collectively, "Indenture D"), between the
         Company (as successor issuer) and BONY;

                  (5) the Sixth Supplemental Indenture, dated as of February 25,
         2000 ("Supplemental Indenture E"), to the Indenture, dated as of
         January 29, 1996, as supplemented by the First Supplemental Indenture,
         dated as of January 29, 1996, the Second Supplemental Indenture, dated
         as of May 22, 1996, the Third Supplemental Indenture, dated as of March
         14, 1997, the Fourth Supplemental Indenture, dated as of March 24,
         1997, and



                                        1

<PAGE>   3



         the Fifth Supplemental Indenture, dated as of March 9, 1999
         (collectively, "Indenture E"), between the Company (as successor
         issuer) and BONY; and

                  (6) the Second Supplemental Indenture, dated as of February
         25, 2000 ("Supplemental Indenture F"), to the Indenture, dated as of
         February 19, 1998, as supplemented by the First Supplemental Indenture,
         dated as of March 9, 1999 (collectively, "Indenture F").

         Also, prior to the Conversion, the Company and State Street Bank and
Trust Company ("State Street"), as trustee, entered into a Third Supplemental
Indenture, dated as of February 25, 2000 ("Supplemental Indenture G"), to the
Indenture, dated as of July 26, 1993, as supplemented by the First Supplemental
Indenture, dated as of September 13, 1994, and the Second Supplemental
Indenture, dated as of March 9, 1999 (collectively, "Indenture G", and together
with Indenture A, Indenture B, Indenture C, Indenture D, Indenture E and
Indenture F, the "Indentures"), between the Company (as successor issuer) and
State Street, as successor trustee.

         The following outstanding securities (the "Securities") of the Company
are governed by the Indentures indicated below:


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
SECURITY                                         GOVERNING INDENTURE
- --------------------------------------------------------------------------------
<S>                                              <C>
10.125% Senior Notes due 2001                    Indenture A
- --------------------------------------------------------------------------------
9.650% Senior Notes due 2003                     Indenture A
- --------------------------------------------------------------------------------
9.800% Senior Debentures due 2012                Indenture A
- --------------------------------------------------------------------------------
10.125% Senior Debentures due 2022               Indenture A
- --------------------------------------------------------------------------------
9.250% Senior Notes due 2002                     Indenture A
- --------------------------------------------------------------------------------
9.875% Senior Debentures due 2022                Indenture A
- --------------------------------------------------------------------------------
8.250% Senior Notes due 2003                     Indenture A
- --------------------------------------------------------------------------------
9.250% Senior Debentures due 2023                Indenture A
- --------------------------------------------------------------------------------
7.375% Senior Notes due 2000                     Indenture A
- --------------------------------------------------------------------------------
8.750% Senior Debentures due 2023                Indenture A
- --------------------------------------------------------------------------------
Medium Term Notes, Series A                      Indenture B
- --------------------------------------------------------------------------------
Medium Term Notes, Series B                      Indenture C
- --------------------------------------------------------------------------------
6.875% Senior Notes due 2006                     Indenture D
- --------------------------------------------------------------------------------
</TABLE>



                                        2

<PAGE>   4

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
SECURITY                                                  GOVERNING INDENTURE
- --------------------------------------------------------------------------------
<S>                                                       <C>
7.875% Senior Debentures due 2026                         Indenture D
- --------------------------------------------------------------------------------
Medium Term Notes, Series C                               Indenture D
- --------------------------------------------------------------------------------
8.72% Subordinated Deferrable Interest Notes due 2045     Indenture E
- --------------------------------------------------------------------------------
10.00% Subordinated Deferrable Interest Notes due 2045    Indenture E
- --------------------------------------------------------------------------------
9.65% Subordinated Deferrable Interest Notes due 2027     Indenture E
- --------------------------------------------------------------------------------
9.72% Subordinated Deferrable Interest Notes due 2036     Indenture E
- --------------------------------------------------------------------------------
7.125% Senior Notes due 2028                              Indenture F
- --------------------------------------------------------------------------------
6.375% Senior Notes due 2003                              Indenture F
- --------------------------------------------------------------------------------
7.250% Senior Notes due 2005                              Indenture G
- --------------------------------------------------------------------------------
7.875% Senior Debentures due 2013                         Indenture G
- --------------------------------------------------------------------------------
8.650% Senior Notes due 2004                              Indenture G
- --------------------------------------------------------------------------------
8.000% Senior Notes due 2005                              Indenture G
- --------------------------------------------------------------------------------
8.750% Senior Debentures due 2015                         Indenture G
- --------------------------------------------------------------------------------
</TABLE>


         Supplemental Indentures A through G are filed as Exhibits 4.1 through
4.7, respectively, to this Current Report on Form 8-K and are incorporated by
reference herein. Supplemental Indentures A through G amend certain provisions
of the Indentures to, among other things, accommodate the Conversion. The
foregoing description of Supplemental Indentures A through G and the Indentures
is qualified in its entirety by the complete text of such documents, which are
filed as exhibits hereto.

ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS.

         (c)      Exhibits.

  Exhibit No.       Description
  -----------       -----------

     2.1            Certificate of conversion to a limited liability company of
                    the Company to AT&T Broadband, LLC

     2.2            Certificate of formation of AT&T Broadband, LLC

     4.1            Supplemental Indenture A



                                        3

<PAGE>   5



     4.2            Supplemental Indenture B

     4.3            Supplemental Indenture C

     4.4            Supplemental Indenture D

     4.5            Supplemental Indenture E

     4.6            Supplemental Indenture F

     4.7            Supplemental Indenture G

     4.8            Indenture, dated as of April 1, 1991, between TCI
                    Communications, Inc. ("TCIC") and The Connecticut National
                    Bank, constituting part of Indenture A (incorporated herein
                    by reference to Exhibit 4.1 to TCIC's Current Report on Form
                    8-K, filed with the Commission on August 15, 1991,
                    Commission File No. 0-5550)

     4.9            First Supplemental Indenture, dated as of March 9, 1999,
                    among the Company, TCIC and BONY to the Indenture, dated as
                    of April 1, 1991, between TCIC and The Connecticut National
                    Bank, constituting part of Indenture A (incorporated herein
                    by reference to Exhibit 4.14 to the Company's Current Report
                    on Form 8-K, dated March 11, 1999)

     4.10           Indenture, dated as of August 9, 1991, between TCIC and
                    BONY, constituting part of Indenture B (incorporated herein
                    by reference to the form of indenture filed as Exhibit 4.5
                    to TCIC's Amendment No. 2 to the Registration Statement on
                    Form S-3, filed with the Commission on July 18, 1991,
                    Registration No. 33-40459)

     4.11           Indenture, dated as of August 4, 1993, between TCIC and
                    BONY, constituting part of Indenture C (incorporated herein
                    by reference to Exhibit 4.12 to TCIC's Current Report on
                    Form 8-K, filed with the Commission on August 5, 1993,
                    Commission File No. 0-5550)

     4.12           First Supplemental Indenture, dated as of September 13,
                    1994, between TCIC and BONY, to the Indenture, dated as of
                    August 4, 1993, between TCIC and BONY, constituting part of
                    Indenture C (incorporated herein by reference to Exhibit 4.1
                    to TCIC's Current Report on Form 8-K, filed with the
                    Commission on October 6, 1994, Commission File No. 0-5550)

     4.13           Second Supplemental Indenture, dated as of March 9, 1999,
                    among the Company, TCIC and BONY to the Indenture, dated as
                    of August 4, 1993, between TCIC and BONY, as supplemented by
                    the First Supplemental Indenture, dated as of September 13,
                    1994, between TCIC and BONY, constituting part of Indenture
                    C (incorporated herein by reference to Exhibit 4.15 to the
                    Company's Current Report on Form 8-K, dated March 11, 1999)



                                        4

<PAGE>   6


     4.14           Indenture, dated as of December 20, 1995, between TCIC and
                    BONY, constituting part of Indenture D (incorporated herein
                    by reference to Exhibit 4.10 to TCIC's Current Report on
                    Form 8-K, filed with the Commission on December 21, 1995,
                    Commission File No. 0-5550)

     4.15           First Supplemental Indenture, dated as of March 9, 1999,
                    among the Company, TCIC and BONY to the Indenture, dated as
                    of December 20, 1995, between TCIC and BONY, constituting
                    part of Indenture D (incorporated herein by reference to
                    Exhibit 4.16 to the Company's Current Report on Form 8-K,
                    dated March 11, 1999)

     4.16           Indenture, dated as of January 29, 1996, between TCIC and
                    BONY, constituting part of Indenture E (incorporated herein
                    by reference to the form of such document filed as Exhibit
                    4.13 to TCIC's Registration Statement on Form S-3,
                    Registration Number 33-64525)

     4.17           First Supplemental Indenture, dated as of January 29, 1996,
                    between TCIC and BONY, to the Indenture, dated as of January
                    29, 1996, between TCIC and BONY, constituting part of
                    Indenture E (incorporated herein by reference to the form of
                    such document filed as Exhibit 4.14 to TCIC's Registration
                    Statement on Form S-3, Registration Number 33-64525)

     4.18           Second Supplemental Indenture, dated as of May 22, 1996,
                    between TCIC and BONY, to the Indenture, dated as of January
                    29, 1996, between TCIC and BONY, as supplemented by the
                    First Supplemental Indenture, dated as of January 29, 1996,
                    between TCIC and BONY, constituting part of Indenture E
                    (incorporated herein by reference to Exhibit 4 to TCIC's
                    Current Report on Form 8-K, filed with the Commission on May
                    23, 1996, Commission File No. 0-5550)

     4.19           Third Supplemental Indenture, dated as of March 14, 1997,
                    between TCIC and BONY, to the Indenture, dated as of January
                    29, 1996, between TCIC and BONY, as supplemented by the
                    First Supplemental Indenture, dated as of January 29, 1996,
                    between TCIC and BONY, and the Second Supplemental
                    Indenture, dated as of May 22, 1996, between TCIC and BONY,
                    constituting part of Indenture E (incorporated herein by
                    reference to Exhibit 4.1 to TCIC's Current Report on Form
                    8-K, filed with the Commission on March 12, 1997, Commission
                    File No. 0-5550)

     4.20           Fourth Supplemental Indenture, dated as of March 24, 1997,
                    between TCIC and BONY, to the Indenture, dated as of January
                    29, 1996, between TCIC and BONY, as supplemented by the
                    First Supplemental Indenture, dated as of January 29, 1996,
                    between TCIC and BONY, the Second Supplemental Indenture,
                    dated as of May 22, 1996, between TCIC and BONY, and the
                    Third Supplemental Indenture, dated as of March 14, 1997,
                    between TCIC and BONY, constituting part of Indenture E


                                        5

<PAGE>   7



                    (incorporated herein by reference to Exhibit 4.11 to the
                    Company's Current Report on Form 8-K, dated March 11, 1999)

     4.21           Fifth Supplemental Indenture, dated as of March 9, 1999,
                    among the Company, TCIC and BONY to the Indenture, dated as
                    of January 29, 1996, between TCIC and BONY as supplemented
                    by the First Supplemental Indenture, dated as of January 29,
                    1996, between TCIC and BONY, the Second Supplemental
                    Indenture, dated as of May 22, 1996, between TCIC and BONY,
                    the Third Supplemental Indenture, dated as of March 14,
                    1997, between TCIC and BONY, and the Fourth Supplemental
                    Indenture, dated as of March 24, 1997, between TCIC and BONY
                    constituting part of Indenture E (incorporated herein by
                    reference to Exhibit 4.17 to the Company's Current Report on
                    Form 8-K, dated March 11, 1999)

     4.22           Indenture, dated as of February 19, 1998, between TCIC and
                    BONY, constituting part of Indenture F (incorporated herein
                    by reference to Exhibit 4.1 to TCIC's Current Report on Form
                    8-K, filed with the Commission on February 24, 1998,
                    Commission File No. 0-5550)

     4.23           First Supplemental Indenture, dated as of March 9, 1999,
                    among the Company, TCIC and BONY to the Indenture, dated as
                    of February 19, 1998, between TCIC and BONY, constituting
                    part of Indenture F (incorporated herein by reference to
                    Exhibit 4.18 to the Company's Current Report on Form 8-K,
                    dated March 11, 1999)

     4.24           Indenture, dated as of July 26, 1993, between TCIC and
                    Shawmut Bank Connecticut, National Association ("Shawmut"),
                    constituting part of Indenture G (incorporated herein by
                    reference to Exhibit 4.9 to TCIC's Current Report on Form
                    8-K, filed with the Commission on August 4, 1993, Commission
                    File No. 0-5550)

     4.25           First Supplemental Indenture, dated as of September 13,
                    1994, between TCIC and Shawmut, to the Indenture, dated as
                    of July 26, 1993, between TCIC and Shawmut, constituting
                    part of Indenture G (incorporated herein by reference to
                    Exhibit 4.1 to TCIC's Current Report on Form 8-K, filed with
                    the Commission on September 21, 1994, Commission File No.
                    0-5550)

     4.26           Second Supplemental Indenture, dated as of March 9, 1999,
                    among the Company, TCIC and State Street to the Indenture,
                    dated as of July 26, 1993, between TCIC and Shawmut, as
                    supplemented by the First Supplemental Indenture, dated as
                    of September 13, 1994, between TCIC and Shawmut,
                    constituting part of Indenture G (incorporated herein by
                    reference to Exhibit 4.13 to the Company's Current Report on
                    Form 8-K, dated March 11, 1999)




                                        6

<PAGE>   8



                                    SIGNATURE

         Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended, the registrant has duly caused this report to be signed on its behalf
by the undersigned hereunto duly authorized.

Date:  March 10, 2000

                              AT&T BROADBAND, LLC
                              (formerly known as Tele-Communications, Inc.)


                              By:   /s/ Daniel E. Somers
                                    --------------------
                              Name: Daniel E. Somers
                              Title: President and Chief Executive Officer




<PAGE>   9


                               INDEX TO EXHIBITS


<TABLE>
<CAPTION>
  Exhibit No.       Description
  -----------       -----------
<S>                 <C>
     2.1            Certificate of conversion to a limited liability company of
                    the Company to AT&T Broadband, LLC

     2.2            Certificate of formation of AT&T Broadband, LLC

     4.1            Supplemental Indenture A

     4.2            Supplemental Indenture B

     4.3            Supplemental Indenture C

     4.4            Supplemental Indenture D

     4.5            Supplemental Indenture E

     4.6            Supplemental Indenture F

     4.7            Supplemental Indenture G
</TABLE>





<PAGE>   1
                                                                     Exhibit 2.1



             CERTIFICATE OF CONVERSION TO LIMITED LIABILITY COMPANY
                                       OF
                            TELE-COMMUNICATIONS, INC.
                                       TO
                               AT&T BROADBAND, LLC

         This Certificate of Conversion to Limited Liability Company, dated as
of March 10, 2000, is being duly executed and filed by Tele-Communications,
Inc., a Delaware corporation (the "Company"), and Mary M. McChesney, as an
authorized person of AT&T Broadband, LLC, a Delaware limited liability company
(the "LLC"), to convert the Company to the LLC, under the Delaware Limited
Liability Company Act (6 Del. C. Sections 18-101 et seq.) and the General
Corporation Law of the State of Delaware (8 Del. C. Section 101, et seq.) (the
"GCL").

         1. The Company's name when it was originally incorporated was
TCI/Liberty Holding Company and immediately prior to the filing of this
Certificate of Conversion to Limited Liability Company was Tele-Communications,
Inc.

         2. The Company filed its original certificate of incorporation with the
Secretary of State of the State of Delaware and was first incorporated on
January 24, 1994, in the State of Delaware, and was incorporated in the State of
Delaware immediately prior to the filing of this Certificate of Conversion to
Limited Liability Company.

         3. The name of the LLC into which the Company shall be converted as set
forth in its certificate of formation is AT&T Broadband, LLC.

         4. The conversion of the Company to the LLC has been approved in
accordance with the provisions of Sections 228 and 266 of the GCL.

         5. The conversion of the Company to the LLC shall be effective upon the
filing of this Certificate of Conversion to Limited Liability Company and a
certificate of formation with the Secretary of State of the State of Delaware.

         IN WITNESS WHEREOF, the undersigned have executed this Certificate of
Conversion to Limited Liability Company as of the date first-above written.


Tele-Communications, Inc.


By:
     -----------------------------            ---------------------------
     Name:  Terrel E. Davis                   Name:  Mary M. McChesney
     Title:  Senior Vice President            Authorized Person of LLC



<PAGE>   1
                                                                     Exhibit 2.2




                            CERTIFICATE OF FORMATION

                                       OF

                               AT&T BROADBAND, LLC


         This Certificate of Formation of AT&T Broadband, LLC (the "LLC"), dated
as of March 10, 2000, is being duly executed and filed by Mary M. McChesney, as
an authorized person, to form a limited liability company under the Delaware
Limited Liability Company Act (6 Del.C. Sections 18-101, et seq.).

         FIRST. The name of the limited liability company formed hereby is AT&T
Broadband, LLC.

         SECOND. The address of the registered office of the LLC in the State of
Delaware is c/o The Corporation Trust Company, Corporation Trust Center, 1209
Orange Street, Wilmington, New Castle County, Delaware 19801.

         THIRD. The name and address of the registered agent for service of
process on the LLC in the State of Delaware is The Corporation Trust Company,
Corporation Trust Center, 1209 Orange Street, Wilmington, New Castle County,
Delaware 19801.

         IN WITNESS WHEREOF, the undersigned has executed this Certificate of
Formation as of the date first above written.



                                                   -----------------------------
                                                   Name:  Mary M. McChesney
                                                   Authorized Person



<PAGE>   1
                                                                     EXHIBIT 4.1
================================================================================
                            TELE-COMMUNICATIONS, INC.


                                       and


                          THE BANK OF NEW YORK, Trustee

                                ----------------


                          SECOND SUPPLEMENTAL INDENTURE
                          Dated as of February 25, 2000


                Supplement to Indenture Dated as of April 1, 1991
                               as supplemented by
             First Supplemental Indenture Dated as of March 9, 1999


                              --------------------


                          10.125% Senior Notes due 2001
                          9.650% Senior Notes due 2003
                        9.800% Senior Debentures due 2012
                       10.125% Senior Debentures due 2022
                          9.250% Senior Notes due 2002
                        9.875% Senior Debentures due 2022
                          8.250% Senior Notes due 2003
                       9.250% Senior Debentures due 2023
                          7.375% Senior Notes due 2000
                         8.750% Senior Debentures 2023


================================================================================

<PAGE>   2

         THIS SECOND SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") is
made as of February 25, 2000, between TELE-COMMUNICATIONS, INC., a Delaware
corporation ("TCI" or, the "Company"), as successor issuer, and THE BANK OF NEW
YORK, a New York banking corporation (the "Trustee"), as trustee.


                                    RECITALS

         WHEREAS, TCI and the Trustee (as successor trustee to The Connecticut
National Bank ("Connecticut")) are parties to an Indenture, dated as of April 1,
1991, as supplemented by a First Supplemental Indenture, dated as of March 9,
1999 (collectively, the "Original Indenture"), pursuant to which the Company
issued (as successor issuer), and Connecticut authenticated and delivered the
following securities which are, as of the date hereof, currently outstanding
(collectively, the "Securities"):

(a) $100 million aggregate principal amount of the Company's 10.125% Senior
Notes due 2001;

(b) $150 million aggregate principal amount of the Company's 9.650% Senior Notes
due 2003;

(c) $600 million aggregate principal amount of the Company's 9.800% Senior
Debentures due 2012;

(d) $150 million aggregate principal amount of the Company's 10.125% Senior
Debentures due 2022;

(e) $200 million aggregate principal amount of the Company's 9.250% Senior Notes
due 2002;

(f) $100 million aggregate principal amount of the Company's 9.875% Senior
Debentures due 2022;

(g) $550 million aggregate principal amount of the Company's 8.250% Senior Notes
due 2003;

(h) $500 million aggregate principal amount of the Company's 9.250% Senior
Debentures due 2023;

(i) $300 million aggregate principal amount of the Company's 7.375% Senior Notes
due 2000; and

(j) $250 million aggregate principal amount of the Company's 8.750% Senior
Debentures due 2023;

         WHEREAS, the Board of Directors of TCI has determined that it is in the
best interests of TCI to convert its corporate form from a Delaware corporation
to a Delaware limited liability company pursuant to Section 266 of the Delaware
General Corporation Law and Section 18-214 of the Delaware Limited Liability
Company Act (the "Conversion");

         WHEREAS, the Board of Directors of TCI has determined that it is
advisable to amend certain provisions of the Original Indenture which may affect
the Conversion;

         WHEREAS, the Original Indenture provides that the Company and the
Trustee may amend or supplement the Original Indenture or the Securities of any
series without notice to or consent of any Holder of Securities or coupons to
make any change that, in the opinion of the Board of Directors, does not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon;


                                      - 1-
<PAGE>   3

         WHEREAS, the Board of Directors of TCI has determined that the
amendments to the Indenture contained in this Supplemental Indenture do not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon; and

         WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary action on the part of TCI.

         NOW, THEREFORE, TCI and the Trustee agree as follows for the equal and
ratable benefit of the Holders:

                                   ARTICLE I

                           DEFINITIONS; INTERPRETATION

SECTION 1.1 Definitions. Capitalized terms that are defined in the preamble or
            the recitals hereto shall have such meanings throughout this
            Supplemental Indenture. Capitalized terms used but not defined in
            this Supplemental Indenture have the meanings assigned thereto in
            the Original Indenture. The meanings assigned to all defined terms
            used in this Supplemental Indenture shall be equally applicable to
            both the singular and plural forms of such defined terms. The term
            "Indenture" as used herein means the Original Indenture, as amended
            and supplemented by this Supplemental Indenture, or as otherwise
            supplemented or amended from time to time by one or more indentures
            supplemental thereto or hereto entered into pursuant to the
            applicable provisions of the Indenture.

SECTION 1.2 Interpretation. References in the Original Indenture (including
            references in the Original Indenture as amended or supplemented
            hereby) to "this Indenture" (and indirect references such as
            "hereunder," "herein" and "hereof") shall be deemed references to
            the Original Indenture as amended and supplemented hereby. All of
            the covenants, agreements and provisions of this Supplemental
            Indenture shall be deemed to be and construed as part of the
            Original Indenture to the same effect as if fully set forth therein
            and shall be fully enforceable in the manner provided in the
            Original Indenture. Except as otherwise provided in this
            Supplemental Indenture, all of the covenants, agreements and
            provisions of the Original Indenture shall remain in full force and
            effect.



                                       -2-
<PAGE>   4

                                   ARTICLE II

                                   AMENDMENTS


SECTION 2.1 Amendments. The following provisions of the Original Indenture are
            hereby amended, modified, supplemented or replaced as follows:

     (a)    The definition of "Board of Directors" contained in Article One,
          Section 1.01 of the Original Indenture is amended to read in its
          entirety as follows: "Board of Directors means the Board of Directors
          of the Company or any authorized committee thereof, or, if the Company
          is not a corporation, the equivalent decision making body thereof or
          authorized committee thereof."

     (b)    The definition of "Officer" contained in Article One, Section
          1.01 of the Original Indenture is amended to add the words "(if any)"
          after the words "Chairman of the Board."

     (c)    The definition of "Subsidiary" contained in Article One, Section
          1.01 of the Original Indenture is amended in its entirety to read as
          follows: "Subsidiary means any corporation, association, partnership
          or other business entity of which a majority of the total voting power
          of the capital stock or other interests (including partnership
          interests) entitled (without regard to the occurrence of a
          contingency) to vote in the election of directors, managers or
          trustees thereof is at the time owned or controlled, directly or
          indirectly, by (i) the Company, (ii) the Company and one or more of
          its Subsidiaries or (iii) one or more Subsidiaries of the Company."

     (d)    Article Four, Section 4.08 is hereby amended to replace the word
          "corporate" appearing in the heading to such section and as the second
          to the last word of such section with the word "legal."

     (e)    Article Five is hereby amended to replace the word "CORPORATION"
          appearing in the heading thereof with the word "ENTITY."

     (f)    Article Five, Section 5.01 is hereby amended to insert the words
          "or limited liability company" after each occurrence of the word
          "corporation."

     (g)    Article Five, Section 5.01 is also hereby amended to insert the
          following words as a new paragraph after the first paragraph thereof:
          "Nothing in this Indenture shall prohibit the Company from effecting a
          conversion pursuant to applicable law of the Company from a
          corporation into a limited liability company or from a limited
          liability company into a corporation, and any such conversion shall
          not be deemed to be a consolidation, merger or transfer subject to the
          requirements of the


                                       -3-
<PAGE>   5



          immediately preceding paragraph, provided, that such conversion by law
          shall not be deemed to affect any obligations or liabilities of the
          Company incurred prior to such conversion (including obligations or
          liabilities with respect to the Securities). Notice of any such
          conversion shall be promptly delivered to the Trustee."

     (h)       Article Ten, Section 10.15 is hereby amended to insert the words
          "or limited liability company" after the word "corporation" in clause
          (2) thereof.

     (i)       Article Ten, Section 10.16 is hereby amended to insert the words
          "or limited liability company" after each occurrence of the word
          "corporation."

                                  ARTICLE III

                                 MISCELLANEOUS

SECTION 3.1    Conflict with the TIA. If any provision of this Supplemental
            Indenture modifies or excludes any provision of the TIA that is
            required under such Act to be part of and govern the Indenture, the
            latter provision of the TIA shall control. If any provision hereof
            modifies or excludes any provision of the TIA that may be so
            modified or excluded, the latter provision of the TIA shall be
            deemed to apply to this Supplemental Indenture, as so modified or
            excluded, as the case may be.

SECTION 3.2    Date and Time of Effectiveness. This Supplemental Indenture
            shall become a legally effective and binding instrument at and as of
            the date hereof.

SECTION 3.3    Securities Deemed Conformed. As of the date hereof, the
            provisions of each Security then outstanding shall be deemed to be
            conformed, without the necessity for any reissuance or exchange of
            such Security or any other action on the part of the Holders, TCI or
            the Trustee, so as to reflect this Supplemental Indenture.

SECTION 3.4    Successors. All agreements of TCI and the Trustee in this
            Supplemental Indenture and in the Indenture shall bind their
            respective successors.

SECTION 3.5    Benefits of Supplemental Indenture. Nothing in this
            Supplemental Indenture, express or implied, shall give to any
            person, other than the parties hereto and their successors
            hereunder, any Agent, Authenticating Agent and the Holders, any
            benefit or any legal or equitable right, remedy or claim under this
            Supplemental Indenture or the Indenture.


                                      -4-
<PAGE>   6



SECTION 3.6    Separability. In case any provision in this Supplemental
            Indenture, or in the Indenture, shall be invalid, illegal or
            unenforceable, the validity, legality and enforceability of the
            remaining provisions shall not in any way be affected or impaired
            thereby, it being intended that all of the provisions hereof shall
            be enforceable to the full extent permitted by law.

SECTION 3.7    Trustee Responsibility. The Trustee assumes no duties,
            responsibilities or liabilities by reason of this Supplemental
            Indenture other than as set forth in the Original Indenture. The
            Trustee assumes no responsibility for the correctness of the
            statements herein contained, which shall be taken as statements of
            TCI. This Supplemental Indenture is executed and accepted by the
            Trustee subject to all of the terms and conditions of its acceptance
            of the trust under the Original Indenture, as fully as if said terms
            and conditions were herein set forth in full.

SECTION 3.8    Headings. The Article and Section headings of this
            Supplemental Indenture have been inserted for convenience of
            reference only, are not to be considered a part of this Supplemental
            Indenture and shall in no way modify or restrict any of the terms or
            provisions hereof.

SECTION 3.9    Counterparts. This Supplemental Indenture may be executed in
            counterparts, each of which shall for all purposes be deemed to be
            an original, and all such counterparts shall together constitute but
            one and the same instrument.

SECTION 3.10   Notices. The addresses for notices to the Company and the
            Trustee set forth in Section 11.02 of the Original Indenture shall
            be amended, without further action, to read in their entirety as
            follows:

       "If to the Company:

                        Tele-Communications, Inc.
                        9197 South Peoria Street
                        Englewood, Colorado 80112
                        Attention: Treasurer

       If to the Trustee:

                        The Bank of New York
                        101 Barclay Street, Floor 21W
                        New York, New York 10286"


                                      -5-
<PAGE>   7


SECTION 3.11   Governing Law. This Supplemental Indenture shall be governed by
               and construed in accordance with the internal laws of the State
               of New York.




                                      -6-
<PAGE>   8

                  IN WITNESS WHEREOF, the parties hereto have caused this
Supplemental Indenture to be duly executed as of the day and year first above
written.



                                                TELE-COMMUNICATIONS, INC.

                                                By
                                                   -----------------------------
                                                   Name:

                                                   Title:


                                                THE BANK OF NEW YORK, as Trustee

                                                By:
                                                   -----------------------------
                                                   Name:

                                                   Title:


                                      -7-

<PAGE>   1
                                                                     EXHIBIT 4.2

================================================================================



                            TELE-COMMUNICATIONS, INC.


                                       and


                          THE BANK OF NEW YORK, Trustee

                                ----------------


                          FIRST SUPPLEMENTAL INDENTURE
                          Dated as of February 25, 2000


               Supplement to Indenture Dated as of August 9, 1991

                              --------------------


                           Medium Term Notes, Series A


================================================================================


<PAGE>   2


         THIS FIRST SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") is
made as of February 25, 2000, between TELE-COMMUNICATIONS, INC., a Delaware
corporation ("TCI" or, the "Company"), as successor issuer, and THE BANK OF NEW
YORK, a New York banking corporation (the "Trustee"), as trustee.


                                    RECITALS

         WHEREAS, TCI and the Trustee are parties to an Indenture, dated as of
August 9, 1991 (the "Original Indenture"), pursuant to which the Company issued
(as successor issuer), and the Trustee authenticated and delivered certain
Medium Term Notes, Series A, which are, as of the date hereof, currently
outstanding (the "Securities");

         WHEREAS, the initial parties to the Original Indenture were the Trustee
and TCI Communications, Inc. (formerly named "Tele-Communications, Inc.")
("TCIC");

         WHEREAS, on March 9, 1999, TCIC merged with an into TCI with TCI being
the surviving corporation (the "Merger"), pursuant to an Agreement and Plan of
Merger, dated as of January 12, 1999;

         WHEREAS, upon the completion of the Merger the separate corporate
existence of TCIC ceased;

         WHEREAS, upon completion of the Merger, TCI assumed all of the
obligations and liabilities of TCIC (including all liabilities and obligations
with respect to the Securities);

         WHEREAS, immediately after giving effect to the Merger, no Default or
Event of Default occurred or was continuing under the Original Indenture;

         WHEREAS, the Board of Directors of TCI has determined that it is in the
best interests of TCI to convert its corporate form from a Delaware corporation
to a Delaware limited liability company pursuant to Section 266 of the Delaware
General Corporation Law and Section 18-214 of the Delaware Limited Liability
Company Act (the "Conversion");

         WHEREAS, the Board of Directors of TCI has determined that it is
advisable to amend certain provisions of the Original Indenture which may affect
the Conversion;

         WHEREAS, the Original Indenture provides that the Company and the
Trustee may amend or supplement the Original Indenture or the Securities of any
series without notice to or consent of any Holder of Securities or coupons to
make any change that, in the opinion of the Board of Directors, does not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon;

                                      - 1 -



<PAGE>   3



         WHEREAS, the Board of Directors of TCI has determined that the
amendments to the Indenture contained in this Supplemental Indenture do not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon; and

         WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary action on the part of TCI.

         NOW, THEREFORE, TCI and the Trustee agree as follows for the equal and
ratable benefit of the Holders:

                                    ARTICLE I

                           DEFINITIONS; INTERPRETATION

         SECTION 1.1 Definitions. Capitalized terms that are defined in the
preamble or the recitals hereto shall have such meanings throughout this
Supplemental Indenture. Capitalized terms used but not defined in this
Supplemental Indenture have the meanings assigned thereto in the Original
Indenture. The meanings assigned to all defined terms used in this Supplemental
Indenture shall be equally applicable to both the singular and plural forms of
such defined terms. The term "Indenture" as used herein means the Original
Indenture, as amended and supplemented by this Supplemental Indenture, or as
otherwise supplemented or amended from time to time by one or more indentures
supplemental thereto or hereto entered into pursuant to the applicable
provisions of the Indenture.

         SECTION 1.2 Interpretation. References in the Original Indenture
(including references in the Original Indenture as amended or supplemented
hereby) to "this Indenture" (and indirect references such as "hereunder,"
"herein" and "hereof") shall be deemed references to the Original Indenture as
amended and supplemented hereby. All of the covenants, agreements and provisions
of this Supplemental Indenture shall be deemed to be and construed as part of
the Original Indenture to the same effect as if fully set forth therein and
shall be fully enforceable in the manner provided in the Original Indenture.
Except as otherwise provided in this Supplemental Indenture, all of the
covenants, agreements and provisions of the Original Indenture shall remain in
full force and effect.



                                       -2-

<PAGE>   4

                                   ARTICLE II

                                   AMENDMENTS

         SECTION 2.1 Amendments. The following provisions of the Original
Indenture are hereby amended, modified, supplemented or replaced as follows:

                  (a) The definition of "Board of Directors" contained in
         Article One, Section 1.01 of the Original Indenture is amended to read
         in its entirety as follows: "Board of Directors means the Board of
         Directors of the Company or any authorized committee thereof, or, if
         the Company is not a corporation, the equivalent decision making body
         thereof or authorized committee thereof."

                  (b) The definition of "Officer" contained in Article One,
         Section 1.01 of the Original Indenture is amended to add the words "(if
         any)" after the words "Chairman of the Board."

                  (c) The definition of "Subsidiary" contained in Article One,
         Section 1.01 of the Original Indenture is amended in its entirety to
         read as follows: "Subsidiary means any corporation, association,
         partnership or other business entity of which a majority of the total
         voting power of the capital stock or other interests (including
         partnership interests) entitled (without regard to the occurrence of a
         contingency) to vote in the election of directors, managers or trustees
         thereof is at the time owned or controlled, directly or indirectly, by
         (i) the Company, (ii) the Company and one or more of its Subsidiaries
         or (iii) one or more Subsidiaries of the Company."

                  (d) Article Four, Section 4.08 is hereby amended to replace
         the word "corporate" appearing in the heading to such section and as
         the second to the last word of such section with the word "legal."

                  (e) Article Five is hereby amended to replace the word
         "CORPORATION" appearing in the heading thereof with the word "ENTITY."

                  (f) Article Five, Section 5.01 is hereby amended to insert the
         words "or limited liability company" after each occurrence of the word
         "corporation."

                  (g) Article Five, Section 5.01 is also hereby amended to
         insert the following words as a new paragraph after the first paragraph
         thereof: "Nothing in this Indenture shall prohibit the Company from
         effecting a conversion pursuant to applicable law of the Company from a
         corporation into a limited liability company or from a limited
         liability company into a corporation, and any such conversion shall not
         be deemed to be a consolidation, merger or transfer subject to the
         requirements of the


                                      -3-

<PAGE>   5

         immediately preceding paragraph, provided, that such conversion by law
         shall not be deemed to affect any obligations or liabilities of the
         Company incurred prior to such conversion (including obligations or
         liabilities with respect to the Securities). Notice of any such
         conversion shall be promptly delivered to the Trustee."

                  (h) Article Ten, Section 10.15 is hereby amended to insert the
         words "or limited liability company" after the word "corporation" in
         clause (2) thereof.

                  (i) Article Ten, Section 10.16 is hereby amended to insert the
         words "or limited liability company" after each occurrence of the word
         "corporation."

                                   ARTICLE III

                                   THE MERGER

         SECTION 3.1 Acknowledgment of Prior Assumption by TCI. TCI, as the
surviving corporation of the Merger, became fully responsible upon the
completion of the Merger, without any further action, for: (i) the payment of
the principal (and premium, if any) and interest on, and any Additional Amounts
with respect to, the Securities according to their tenor and the Indenture; and
(ii) the performance and observance of all of the other covenants and provisions
of the Securities and the Indenture. Upon such assumption, TCI succeeded to and
was substituted for TCIC with the same effect as if it had been named in the
Indenture as the original issuer, and TCIC thereupon was relieved of any further
liability or obligation under the Indenture or upon the Securities. Upon and
following the completion of the Merger, all references to the "Company" in the
Indenture and the Securities are deemed references to TCI, until a successor
replaces it pursuant to the applicable provisions of the Indenture and
thereafter the "Company" shall mean such successor.

         SECTION 3.2 Representations, Warranties and Covenants Regarding the
Merger. TCI represents, warrants and covenants to the Trustee as follows:

                  (a) Immediately following the completion of the Merger, TCI
         was a corporation duly organized and validly existing under the laws of
         the State of Delaware; and

                  (b) Immediately after giving effect to the Merger, no Default
         or Event of Default occurred or was continuing.


                                      -4-

<PAGE>   6

                                   ARTICLE IV

                                  MISCELLANEOUS

         SECTION 4.1 Conflict with the TIA. If any provision of this
Supplemental Indenture modifies or excludes any provision of the TIA that is
required under such Act to be part of and govern the Indenture, the latter
provision of the TIA shall control. If any provision hereof modifies or excludes
any provision of the TIA that may be so modified or excluded, the latter
provision of the TIA shall be deemed to apply to this Supplemental Indenture, as
so modified or excluded, as the case may be.

         SECTION 4.2 Date and Time of Effectiveness. This Supplemental Indenture
shall become a legally effective and binding instrument at and as of the date
hereof.

         SECTION 4.3 Securities Deemed Conformed. As of the date hereof, the
provisions of each Security then outstanding shall be deemed to be conformed,
without the necessity for any reissuance or exchange of such Security or any
other action on the part of the Holders, TCI or the Trustee, so as to reflect
this Supplemental Indenture.

         SECTION 4.4 Successors. All agreements of TCI and the Trustee in this
Supplemental Indenture and in the Indenture shall bind their respective
successors.

         SECTION 4.5 Benefits of Supplemental Indenture. Nothing in this
Supplemental Indenture, express or implied, shall give to any person, other than
the parties hereto and their successors hereunder, any Agent, Authenticating
Agent and the Holders, any benefit or any legal or equitable right, remedy or
claim under this Supplemental Indenture or the Indenture.

         SECTION 4.6 Separability. In case any provision in this Supplemental
Indenture, or in the Indenture, shall be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby, it being intended that all of the
provisions hereof shall be enforceable to the full extent permitted by law.

         SECTION 4.7 Trustee Responsibility. The Trustee assumes no duties,
responsibilities or liabilities by reason of this Supplemental Indenture other
than as set forth in the Original Indenture. The Trustee assumes no
responsibility for the correctness of the statements herein contained, which
shall be taken as statements of TCI. This Supplemental Indenture is executed and
accepted by the Trustee subject to all of the terms and conditions of its


                                      -5-

<PAGE>   7

acceptance of the trust under the Original Indenture, as fully as if said terms
and conditions were herein set forth in full.

         SECTION 4.8 Headings. The Article and Section headings of this
Supplemental Indenture have been inserted for convenience of reference only, are
not to be considered a part of this Supplemental Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.

         SECTION 4.9 Counterparts. This Supplemental Indenture may be executed
in counterparts, each of which shall for all purposes be deemed to be an
original, and all such counterparts shall together constitute but one and the
same instrument.

         SECTION 4.10 Notices. The addresses for notices to the Company and the
Trustee set forth in Section 11.02 of the Original Indenture shall be amended,
without further action, to read in their entirety as follows:

                  "If to the Company:

                           Tele-Communications, Inc.
                           9197 South Peoria Street
                           Englewood, Colorado 80112
                           Attention: Treasurer

                  If to the Trustee:

                           The Bank of New York
                           101 Barclay Street, Floor 21W
                           New York, New York 10286"

         SECTION 4.11 Governing Law. This Supplemental Indenture shall be
governed by and construed in accordance with the internal laws of the State of
New York.



                                      - 6 -



<PAGE>   8


         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the day and year first above written.



                                          TELE-COMMUNICATIONS, INC.

                                          By:
                                             ----------------------------------
                                             Name:
                                             Title:


                                          THE BANK OF NEW YORK, as Trustee

                                          By:
                                             ----------------------------------
                                             Name:
                                             Title:





                                      - 7 -




<PAGE>   1
                                                                     EXHIBIT 4.3


================================================================================




                            TELE-COMMUNICATIONS, INC.


                                       and


                          THE BANK OF NEW YORK, Trustee


                                ----------------



                          THIRD SUPPLEMENTAL INDENTURE
                          Dated as of February 25, 2000


               Supplement to Indenture Dated as of August 4, 1993
                               as supplemented by
         First Supplemental Indenture Dated as of September 13, 1994 and
             Second Supplemental Indenture Dated as of March 9, 1999


                              --------------------

                           Medium Term Notes, Series B



================================================================================



<PAGE>   2



         THIS THIRD SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") is
made as of February 25, 2000, between TELE-COMMUNICATIONS, INC., a Delaware
corporation ("TCI" or, the "Company"), as successor issuer, and THE BANK OF NEW
YORK, a New York banking corporation (the "Trustee"), as trustee.


                                    RECITALS

         WHEREAS, TCI and the Trustee are parties to an Indenture, dated as of
August 4, 1993, as supplemented by a First Supplemental Indenture, dated as of
September 13, 1994, and a Second Supplemental Indenture, dated as of March 9,
1999 (collectively, the "Original Indenture"), pursuant to which the Company
issued (as successor issuer), and the Trustee authenticated and delivered
certain Medium Term Notes, Series B which are, as of the date hereof, currently
outstanding (the "Securities");

         WHEREAS, the Board of Directors of TCI has determined that it is in the
best interests of TCI to convert its corporate form from a Delaware corporation
to a Delaware limited liability company pursuant to Section 266 of the Delaware
General Corporation Law and Section 18-214 of the Delaware Limited Liability
Company Act (the "Conversion");

         WHEREAS, the Board of Directors of TCI has determined that it is
advisable to amend certain provisions of the Original Indenture which may affect
the Conversion;

         WHEREAS, the Original Indenture provides that the Company and the
Trustee may amend or supplement the Original Indenture or the Securities of any
series without notice to or consent of any Holder of Securities or coupons to
make any change that, in the opinion of the Board of Directors, does not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon;

         WHEREAS, the Board of Directors of TCI has determined that the
amendments to the Indenture contained in this Supplemental Indenture do not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon; and

         WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary action on the part of TCI.

         NOW, THEREFORE, TCI and the Trustee agree as follows for the equal and
ratable benefit of the Holders:


                                      - 1 -



<PAGE>   3


                                    ARTICLE I

                           DEFINITIONS; INTERPRETATION


         SECTION 1.1 Definitions. Capitalized terms that are defined in the
preamble or the recitals hereto shall have such meanings throughout this
Supplemental Indenture. Capitalized terms used but not defined in this
Supplemental Indenture have the meanings assigned thereto in the Original
Indenture. The meanings assigned to all defined terms used in this Supplemental
Indenture shall be equally applicable to both the singular and plural forms of
such defined terms. The term "Indenture" as used herein means the Original
Indenture, as amended and supplemented by this Supplemental Indenture, or as
otherwise supplemented or amended from time to time by one or more indentures
supplemental thereto or hereto entered into pursuant to the applicable
provisions of the Indenture.

         SECTION 1.2 Interpretation. References in the Original Indenture
(including references in the Original Indenture as amended or supplemented
hereby) to "this Indenture" (and indirect references such as "hereunder,"
"herein" and "hereof") shall be deemed references to the Original Indenture as
amended and supplemented hereby. All of the covenants, agreements and provisions
of this Supplemental Indenture shall be deemed to be and construed as part of
the Original Indenture to the same effect as if fully set forth therein and
shall be fully enforceable in the manner provided in the Original Indenture.
Except as otherwise provided in this Supplemental Indenture, all of the
covenants, agreements and provisions of the Original Indenture shall remain in
full force and effect.

                                   ARTICLE II

                                   AMENDMENTS

         SECTION 2.1 Amendments. The following provisions of the Original
Indenture are hereby amended, modified, supplemented or replaced as follows:

                  (a) The definition of "Board of Directors" contained in
         Article One, Section 1.01 of the Original Indenture is amended to read
         in its entirety as follows: "Board of Directors means the Board of
         Directors of the Company or any authorized committee thereof, or, if
         the Company is not a corporation, the equivalent decision making body
         thereof or authorized committee thereof."

                  (b) The definition of "Officer" contained in Article One,
         Section 1.01 of the Original Indenture is amended to add the words "(if
         any)" after the words "Chairman of the Board."


                                      -2-

<PAGE>   4

                  (c) The definition of "Subsidiary" contained in Article One,
         Section 1.01 of the Original Indenture is amended in its entirety to
         read as follows: "Subsidiary means any corporation, association,
         partnership or other business entity of which a majority of the total
         voting power of the capital stock or other interests (including
         partnership interests) entitled (without regard to the occurrence of a
         contingency) to vote in the election of directors, managers or trustees
         thereof is at the time owned or controlled, directly or indirectly, by
         (i) the Company, (ii) the Company and one or more of its Subsidiaries
         or (iii) one or more Subsidiaries of the Company."

                  (d) Article Four, Section 4.08 is hereby amended to replace
         the word "corporate" appearing in the heading to such section and as
         the second to the last word of such section with the word "legal."

                  (e) Article Five is hereby amended to replace the word
         "CORPORATION" appearing in the heading thereof with the word "ENTITY."

                  (f) Article Five, Section 5.01 is hereby amended to insert the
         words "or limited liability company" after each occurrence of the word
         "corporation."

                  (g) Article Five, Section 5.01 is also hereby amended to
         insert the following words as a new paragraph after the first paragraph
         thereof: "Nothing in this Indenture shall prohibit the Company from
         effecting a conversion pursuant to applicable law of the Company from a
         corporation into a limited liability company or from a limited
         liability company into a corporation, and any such conversion shall not
         be deemed to be a consolidation, merger or transfer subject to the
         requirements of the immediately preceding paragraph, provided, that
         such conversion by law shall not be deemed to affect any obligations or
         liabilities of the Company incurred prior to such conversion (including
         obligations or liabilities with respect to the Securities). Notice of
         any such conversion shall be promptly delivered to the Trustee."

                  (h) Article Ten, Section 10.15 is hereby amended to insert the
         words "or limited liability company" after the word "corporation" in
         clause (2) thereof.

                  (i) Article Ten, Section 10.16 is hereby amended to insert the
         words "or limited liability company" after each occurrence of the word
         "corporation."


                                      -3-

<PAGE>   5

                                   ARTICLE III

                                  MISCELLANEOUS

         SECTION 3.1 Conflict with the TIA. If any provision of this
Supplemental Indenture modifies or excludes any provision of the TIA that is
required under such Act to be part of and govern the Indenture, the latter
provision of the TIA shall control. If any provision hereof modifies or excludes
any provision of the TIA that may be so modified or excluded, the latter
provision of the TIA shall be deemed to apply to this Supplemental Indenture, as
so modified or excluded, as the case may be.

         SECTION 3.2 Date and Time of Effectiveness. This Supplemental Indenture
shall become a legally effective and binding instrument at and as of the date
hereof.

         SECTION 3.3 Securities Deemed Conformed. As of the date hereof, the
provisions of each Security then outstanding shall be deemed to be conformed,
without the necessity for any reissuance or exchange of such Security or any
other action on the part of the Holders, TCI or the Trustee, so as to reflect
this Supplemental Indenture.

         SECTION 3.4 Successors. All agreements of TCI and the Trustee in this
Supplemental Indenture and in the Indenture shall bind their respective
successors.

         SECTION 3.5 Benefits of Supplemental Indenture. Nothing in this
Supplemental Indenture, express or implied, shall give to any person, other than
the parties hereto and their successors hereunder, any Agent, Authenticating
Agent and the Holders, any benefit or any legal or equitable right, remedy or
claim under this Supplemental Indenture or the Indenture.

         SECTION 3.6 Separability. In case any provision in this Supplemental
Indenture, or in the Indenture, shall be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby, it being intended that all of the
provisions hereof shall be enforceable to the full extent permitted by law.

         SECTION 3.7 Trustee Responsibility. The Trustee assumes no duties,
responsibilities or liabilities by reason of this Supplemental Indenture other
than as set forth in the Original Indenture. The Trustee assumes no
responsibility for the correctness of the statements herein contained, which
shall be taken as statements of TCI. This Supplemental Indenture is executed


                                      -4-

<PAGE>   6

and accepted by the Trustee subject to all of the terms and conditions of its
acceptance of the trust under the Original Indenture, as fully as if said terms
and conditions were herein set forth in full.

         SECTION 3.8 Headings. The Article and Section headings of this
Supplemental Indenture have been inserted for convenience of reference only, are
not to be considered a part of this Supplemental Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.

         SECTION 3.9 Counterparts. This Supplemental Indenture may be executed
in counterparts, each of which shall for all purposes be deemed to be an
original, and all such counterparts shall together constitute but one and the
same instrument.

         SECTION 3.10 Notices. The addresses for notices to the Company and the
Trustee set forth in Section 11.02 of the Original Indenture shall be amended,
without further action, to read in their entirety as follows:

                  "If to the Company:

                           Tele-Communications, Inc.
                           9197 South Peoria Street
                           Englewood, Colorado 80112
                           Attention: Treasurer

                  If to the Trustee:

                           The Bank of New York
                           101 Barclay Street, Floor 21W
                           New York, New York 10286"

         SECTION 3.11 Governing Law. This Supplemental Indenture shall be
governed by and construed in accordance with the internal laws of the State of
New York.



                                      - 5 -



<PAGE>   7


         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the day and year first above written.



                                        TELE-COMMUNICATIONS, INC.

                                        By:
                                           ------------------------------------
                                           Name:
                                           Title:


                                        THE BANK OF NEW YORK, as Trustee

                                        By:
                                           ------------------------------------
                                           Name:
                                           Title:


                                      - 6 -



<PAGE>   1
                                                                     EXHIBIT 4.4


===============================================================================





                            TELE-COMMUNICATIONS, INC.


                                       and


                          THE BANK OF NEW YORK, Trustee


                                ----------------



                          SECOND SUPPLEMENTAL INDENTURE
                          Dated as of February 25, 2000


              Supplement to Indenture Dated as of December 20, 1995
                               as supplemented by
             First Supplemental Indenture Dated as of March 9, 1999


                              --------------------


                          6.875% Senior Notes due 2006
                        7.875% Senior Debentures due 2026
                           Medium Term Notes, Series C



===============================================================================



<PAGE>   2



         THIS SECOND SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") is
made as of February 25, 2000, between TELE-COMMUNICATIONS, INC., a Delaware
corporation ("TCI" or, the "Company"), as successor issuer, and THE BANK OF NEW
YORK, a New York banking corporation (the "Trustee"), as trustee.


                                    RECITALS

         WHEREAS, TCI and the Trustee are parties to an Indenture, dated as of
December 29, 1995, as supplemented by a First Supplemental Indenture, dated as
of March 9, 1999 (collectively, the "Original Indenture"), pursuant to which the
Company issued (as successor issuer), and the Trustee authenticated and
delivered the following securities which are, as of the date hereof, currently
outstanding (collectively, the "Securities"):

(a) $400 million aggregate principal amount of the Company's 6.875% Senior Notes
    due 2006;

(b) $600 million aggregate principal amount of the Company's 7.875%
    Senior Debentures due 2026; and

(c) certain Medium Term Notes, Series C;

         WHEREAS, the Board of Directors of TCI has determined that it is in the
best interests of TCI to convert its corporate form from a Delaware corporation
to a Delaware limited liability company pursuant to Section 266 of the Delaware
General Corporation Law and Section 18-214 of the Delaware Limited Liability
Company Act (the "Conversion");

         WHEREAS, the Board of Directors of TCI has determined that it is
advisable to amend certain provisions of the Original Indenture which may affect
the Conversion;

         WHEREAS, the Original Indenture provides that the Company and the
Trustee may amend or supplement the Original Indenture or the Securities of any
series without notice to or consent of any Holder of Securities or coupons to
make any change that, in the opinion of the Board of Directors, does not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon;

         WHEREAS, the Board of Directors of TCI has determined that the
amendments to the Indenture contained in this Supplemental Indenture do not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon; and

         WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary action on the part of TCI.

         NOW, THEREFORE, TCI and the Trustee agree as follows for the equal and
ratable benefit of the Holders:


                                      - 1 -



<PAGE>   3



                                    ARTICLE I

                           DEFINITIONS; INTERPRETATION

         SECTION 1.1 Definitions. Capitalized terms that are defined in the
preamble or the recitals hereto shall have such meanings throughout this
Supplemental Indenture. Capitalized terms used but not defined in this
Supplemental Indenture have the meanings assigned thereto in the Original
Indenture. The meanings assigned to all defined terms used in this Supplemental
Indenture shall be equally applicable to both the singular and plural forms of
such defined terms. The term "Indenture" as used herein means the Original
Indenture, as amended and supplemented by this Supplemental Indenture, or as
otherwise supplemented or amended from time to time by one or more indentures
supplemental thereto or hereto entered into pursuant to the applicable
provisions of the Indenture.

         SECTION 1.2 Interpretation. References in the Original Indenture
(including references in the Original Indenture as amended or supplemented
hereby) to "this Indenture" (and indirect references such as "hereunder,"
"herein" and "hereof") shall be deemed references to the Original Indenture as
amended and supplemented hereby. All of the covenants, agreements and provisions
of this Supplemental Indenture shall be deemed to be and construed as part of
the Original Indenture to the same effect as if fully set forth therein and
shall be fully enforceable in the manner provided in the Original Indenture.
Except as otherwise provided in this Supplemental Indenture, all of the
covenants, agreements and provisions of the Original Indenture shall remain in
full force and effect.

                                   ARTICLE II

                                   AMENDMENTS

         SECTION 2.1 Amendments. The following provisions of the Original
Indenture are hereby amended, modified, supplemented or replaced as follows:

                  (a) The definition of "Board of Directors" contained in
         Article One, Section 1.01 of the Original Indenture is amended to read
         in its entirety as follows: "Board of Directors means the Board of
         Directors of the Company or any authorized committee thereof, or, if
         the Company is not a corporation, the equivalent decision making body
         thereof or authorized committee thereof."



                                      - 2 -



<PAGE>   4

                  (b) The definition of "Officer" contained in Article One,
         Section 1.01 of the Original Indenture is amended to add the words "(if
         any)" after the words "Chairman of the Board."

                  (c) The definition of "Subsidiary" contained in Article One,
         Section 1.01 of the Original Indenture is amended in its entirety to
         read as follows: "Subsidiary means any corporation, association,
         partnership or other business entity of which a majority of the total
         voting power of the capital stock or other interests (including
         partnership interests) entitled (without regard to the occurrence of a
         contingency) to vote in the election of directors, managers or trustees
         thereof is at the time owned or controlled, directly or indirectly, by
         (i) the Company, (ii) the Company and one or more of its Subsidiaries
         or (iii) one or more Subsidiaries of the Company."

                  (d) Article Four, Section 4.08 is hereby amended to replace
         the word "corporate" appearing in the heading to such section and as
         the second to the last word of such section with the word "legal."

                  (e) Article Five is hereby amended to replace the word
         "CORPORATION" appearing in the heading thereof with the word "ENTITY."

                  (f) Article Five, Section 5.01 is hereby amended to insert the
         words "or limited liability company" after each occurrence of the word
         "corporation."

                  (g) Article Five, Section 5.01 is also hereby amended to
         insert the following words as a new paragraph after the first paragraph
         thereof: "Nothing in this Indenture shall prohibit the Company from
         effecting a conversion pursuant to applicable law of the Company from a
         corporation into a limited liability company or from a limited
         liability company into a corporation, and any such conversion shall not
         be deemed to be a consolidation, merger or transfer subject to the
         requirements of the immediately preceding paragraph, provided, that
         such conversion by law shall not be deemed to affect any obligations or
         liabilities of the Company incurred prior to such conversion (including
         obligations or liabilities with respect to the Securities). Notice of
         any such conversion shall be promptly delivered to the Trustee."

                  (h) Article Ten, Section 10.15 is hereby amended to insert the
         words "or limited liability company" after the word "corporation" in
         clause (2) thereof.



                                      - 3 -


<PAGE>   5

                                   ARTICLE III

                                  MISCELLANEOUS

         SECTION 3.1 Conflict with the TIA. If any provision of this
Supplemental Indenture modifies or excludes any provision of the TIA that is
required under such Act to be part of and govern the Indenture, the latter
provision of the TIA shall control. If any provision hereof modifies or excludes
any provision of the TIA that may be so modified or excluded, the latter
provision of the TIA shall be deemed to apply to this Supplemental Indenture, as
so modified or excluded, as the case may be.

         SECTION 3.2 Date and Time of Effectiveness. This Supplemental
Indenture shall become a legally effective and binding instrument at and as of
the date hereof.

         SECTION 3.3 Securities Deemed Conformed. As of the date hereof, the
provisions of each Security then outstanding shall be deemed to be conformed,
without the necessity for any reissuance or exchange of such Security or any
other action on the part of the Holders, TCI or the Trustee, so as to reflect
this Supplemental Indenture.

         SECTION 3.4 Successors. All agreements of TCI and the Trustee in this
Supplemental Indenture and in the Indenture shall bind their respective
successors.

         SECTION 3.5 Benefits of Supplemental Indenture. Nothing in this
Supplemental Indenture, express or implied, shall give to any person, other than
the parties hereto and their successors hereunder, any Agent, Authenticating
Agent and the Holders, any benefit or any legal or equitable right, remedy or
claim under this Supplemental Indenture or the Indenture.

         SECTION 3.6 Separability. In case any provision in this Supplemental
Indenture, or in the Indenture, shall be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby, it being intended that all of the
provisions hereof shall be enforceable to the full extent permitted by law.

         SECTION 3.7 Trustee Responsibility. The Trustee assumes no duties,
responsibilities or liabilities by reason of this Supplemental Indenture other
than as set forth in the Original Indenture. The Trustee assumes no
responsibility for the correctness of the statements herein contained, which


                                      -4-

<PAGE>   6

shall be taken as statements of TCI. This Supplemental Indenture is executed and
accepted by the Trustee subject to all of the terms and conditions of its
acceptance of the trust under the Original Indenture, as fully as if said terms
and conditions were herein set forth in full.

         SECTION 3.8 Headings. The Article and Section headings of this
Supplemental Indenture have been inserted for convenience of reference only, are
not to be considered a part of this Supplemental Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.

         SECTION 3.9 Counterparts. This Supplemental Indenture may be executed
in counterparts, each of which shall for all purposes be deemed to be an
original, and all such counterparts shall together constitute but one and the
same instrument.

         SECTION 3.10 Notices. The addresses for notices to the Company and the
Trustee set forth in Section 11.02 of the Original Indenture shall be amended,
without further action, to read in their entirety as follows:

                  "If to the Company:

                           Tele-Communications, Inc.
                           9197 South Peoria Street
                           Englewood, Colorado 80112
                           Attention: Treasurer

                  If to the Trustee:

                           The Bank of New York
                           101 Barclay Street, Floor 21W
                           New York, New York 10286"

         SECTION 3.11 Governing Law. This Supplemental Indenture shall be
governed by and construed in accordance with the internal laws of the State of
New York.



                                      - 5 -



<PAGE>   7


         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the day and year first above written.



                                         TELE-COMMUNICATIONS, INC.

                                         By:
                                            -----------------------------------
                                            Name:
                                            Title:


                                         THE BANK OF NEW YORK, as Trustee

                                         By:
                                            -----------------------------------
                                            Name:
                                            Title:





                                      - 6 -



<PAGE>   1
                                                                     EXHIBIT 4.5


                            TELE-COMMUNICATIONS, INC.


                                       and


                          THE BANK OF NEW YORK, Trustee

                                ----------------


                          SIXTH SUPPLEMENTAL INDENTURE
                          Dated as of February 25, 2000


              Supplement to Indenture Dated as of January 29, 1996
                               as supplemented by
           First Supplemental Indenture Dated as of January 29, 1996,
             Second Supplemental Indenture Dated as of May 22, 1996,
            Third Supplemental Indenture Dated as of March 14, 1997,
          Fourth Supplemental Indenture Dated as of March 24, 1997, and
             Fifth Supplemental Indenture Dated as of March 9, 1999


                              --------------------


              8.72% Subordinated Deferrable Interest Notes due 2045
             10.00% Subordinated Deferrable Interest Notes due 2045
              9.65% Subordinated Deferrable Interest Notes due 2027
              9.72% Subordinated Deferrable Interest Notes due 2036



<PAGE>   2

     THIS SIXTH SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") is made
as of February 25, 2000, between TELE-COMMUNICATIONS, INC., a Delaware
corporation ("TCI" or, the "Company"), as successor issuer, and THE BANK OF NEW
YORK, a New York banking corporation (the "Trustee"), as trustee.


                                    RECITALS

     WHEREAS, TCI and the Trustee are parties to an Indenture, dated as of
January 29, 1996, as supplemented by a First Supplemental Indenture, dated as of
January 29, 1996, a Second Supplemental Indenture, dated as of May 22, 1996, a
Third Supplemental Indenture, dated as of March 14, 1997, a Fourth Supplemental
Indenture, dated as of March 24, 1997, and a Fifth Supplemental Indenture, dated
as of March 9, 1999 (collectively, the "Original Indenture"), pursuant to which
the Company issued (as successor issuer), and the Trustee authenticated and
delivered the following securities which are, as of the date hereof, currently
outstanding (collectively, the "Securities"):

(a) $500 million aggregate principal amount of the Company's 8.72% Subordinated
Deferrable Interest Notes due 2045;

(b) $500 million aggregate principal amount of the Company's 10.00% Subordinated
Deferrable Interest Notes due 2045;

(c) $300 million aggregate principal amount of the Company's 9.65% Subordinated
Deferrable Interest Notes due 2027; and

(d) $200 million aggregate principal amount of the Company's 9.72% Subordinated
Deferrable Interest Notes due 2036;

     WHEREAS, the Board of Directors of TCI has determined that it is in the
best interests of TCI to convert its corporate form from a Delaware corporation
to a Delaware limited liability company pursuant to Section 266 of the Delaware
General Corporation Law and Section 18-214 of the Delaware Limited Liability
Company Act (the "Conversion");

     WHEREAS, the Board of Directors of TCI has determined that it is advisable
to amend certain provisions of the Original Indenture which may affect the
Conversion;

     WHEREAS, the Original Indenture provides that the Company and the Trustee
may amend or supplement the Original Indenture or the Securities of any series
without notice to or consent of any Holder of Securities or coupons to make any
change that, in the opinion of the Board of Directors, does not materially
adversely affect the rights of any Securityholder or the Holder of any coupon;



                                      -1-
<PAGE>   3

     WHEREAS, the Board of Directors of TCI has determined that the amendments
to the Indenture contained in this Supplemental Indenture do not materially
adversely affect the rights of any Securityholder or the Holder of any coupon;
and

     WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary action on the part of TCI.

     NOW, THEREFORE, TCI and the Trustee agree as follows for the equal and
ratable benefit of the Holders:

                                   ARTICLE I

                          DEFINITIONS; INTERPRETATION

     SECTION 1.1         Definitions. Capitalized terms that are defined in the
                    preamble or the recitals hereto shall have such meanings
                    throughout this Supplemental Indenture. Capitalized terms
                    used but not defined in this Supplemental Indenture have the
                    meanings assigned thereto in the Original Indenture. The
                    meanings assigned to all defined terms used in this
                    Supplemental Indenture shall be equally applicable to both
                    the singular and plural forms of such defined terms. The
                    term "Indenture" as used herein means the Original
                    Indenture, as amended and supplemented by this Supplemental
                    Indenture, or as otherwise supplemented or amended from time
                    to time by one or more indentures supplemental thereto or
                    hereto entered into pursuant to the applicable provisions of
                    the Indenture.

     SECTION 1.2         Interpretation. References in the Original Indenture
                    (including references in the Original Indenture as amended
                    or supplemented hereby) to "this Indenture" (and indirect
                    references such as "hereunder," "herein" and "hereof") shall
                    be deemed references to the Original Indenture as amended
                    and supplemented hereby. All of the covenants, agreements
                    and provisions of this Supplemental Indenture shall be
                    deemed to be and construed as part of the Original Indenture
                    to the same effect as if fully set forth therein and shall
                    be fully enforceable in the manner provided in the Original
                    Indenture. Except as otherwise provided in this Supplemental
                    Indenture, all of the covenants, agreements and provisions
                    of the Original Indenture shall remain in full force and
                    effect.

                                   ARTICLE II

                                   AMENDMENTS

                                       -2-
<PAGE>   4

     SECTION 2.1         Amendments. The following provisions of the Original
                   Indenture are hereby amended, modified, supplemented or
                   replaced as follows:

          (a)            The definition of "Board of Directors" contained in
                    Article One, Section 1.01 of the Original Indenture is
                    amended to read in its entirety as follows: "Board of
                    Directors means the Board of Directors of the Company or any
                    authorized committee thereof, or, if the Company is not a
                    corporation, the equivalent decision making body thereof or
                    authorized committee thereof."

          (b)            The definition of "Officer" contained in Article
                    One, Section 1.01 of the Original Indenture is amended to
                    add the words "(if any)" after the words "Chairman of the
                    Board."

          (c)            The definition of "Subsidiary" contained in
                    Article One, Section 1.01 of the Original Indenture is
                    amended in its entirety to read as follows: "Subsidiary
                    means any corporation, association, partnership or other
                    business entity of which a majority of the total voting
                    power of the capital stock or other interests (including
                    partnership interests) entitled (without regard to the
                    occurrence of a contingency) to vote in the election of
                    directors, managers or trustees thereof is at the time owned
                    or controlled, directly or indirectly, by (i) the Company,
                    (ii) the Company and one or more of its Subsidiaries or
                    (iii) one or more Subsidiaries of the Company."

          (d)            Article Four, Section 4.04 is hereby amended to
                    replace the word "corporate" appearing in the heading to
                    such section and as the second to the last word of such
                    section with the word "legal."

          (e)            Article Five is hereby amended to replace the word
                    "CORPORATION" appearing in the heading thereof with the word
                    "ENTITY."

          (f)            Article Five, Section 5.01 is hereby amended to
                    insert the words "or limited liability company" after each
                    occurrence of the word "corporation."

          (g)            Article Five, Section 5.01 is also hereby amended
                    to insert the following words as a new paragraph after the
                    first paragraph thereof: "Nothing in this Indenture shall
                    prohibit the Company from effecting a conversion pursuant to
                    applicable law of the Company from a corporation into a
                    limited liability company or from a limited liability
                    company into a corporation, and any such conversion shall
                    not be deemed to be a consolidation, merger or transfer
                    subject to the requirements of the


                                       -3-
<PAGE>   5
                    immediately preceding paragraph, provided, that such
                    conversion by law shall not be deemed to affect any
                    obligations or liabilities of the Company incurred prior to
                    such conversion (including obligations or liabilities with
                    respect to the Securities). Notice of any such conversion
                    shall be promptly delivered to the Trustee."

          (h)            The second sentence of the third paragraph of
                    Section 6.3 to the First Supplemental Indenture of the
                    Original Indenture is hereby amended to insert the words "or
                    limited liability company" after each occurrence of the word
                    "corporation."

          (i)            The second sentence of the third paragraph of
                    Section 6.3 to the Second Supplemental Indenture of the
                    Original Indenture is hereby amended to insert the words "or
                    limited liability company" after each occurrence of the word
                    "corporation."

          (j)            The second sentence of the third paragraph of
                    Section 6.3 to the Third Supplemental Indenture of the
                    Original Indenture is hereby amended to insert the words "or
                    limited liability company" after each occurrence of the word
                    "corporation."

          (k)            The second sentence of the third paragraph of
                    Section 6.3 to the Fourth Supplemental Indenture of the
                    Original Indenture is hereby amended to insert the words "or
                    limited liability company" after each occurrence of the word
                    "corporation."


                                  ARTICLE III

                                 MISCELLANEOUS

     SECTION 3.1         Conflict with the TIA. If any provision of this
                    Supplemental Indenture modifies or excludes any provision of
                    the TIA that is required under such Act to be part of and
                    govern the Indenture, the latter provision of the TIA shall
                    control. If any provision hereof modifies or excludes any
                    provision of the TIA that may be so modified or excluded,
                    the latter provision of the TIA shall be deemed to apply to
                    this Supplemental Indenture, as so modified or excluded, as
                    the case may be.

     SECTION 3.2         Date and Time of Effectiveness. This Supplemental
                    Indenture shall become a legally effective and binding
                    instrument at and as of the date hereof.

                                       -4-
<PAGE>   6

     SECTION 3.3         Securities Deemed Conformed. As of the date
                    hereof, the provisions of each Security then outstanding
                    shall be deemed to be conformed, without the necessity for
                    any reissuance or exchange of such Security or any other
                    action on the part of the Holders, TCI or the Trustee, so as
                    to reflect this Supplemental Indenture.

     SECTION 3.4         Successors. All agreements of TCI and the Trustee
                    in this Supplemental Indenture and in the Indenture shall
                    bind their respective successors.

     SECTION 3.5         Benefits of Supplemental Indenture. Nothing in
                    this Supplemental Indenture, express or implied, shall give
                    to any person, other than the parties hereto and their
                    successors hereunder, any Agent, Authenticating Agent and
                    the Holders, any benefit or any legal or equitable right,
                    remedy or claim under this Supplemental Indenture or the
                    Indenture.

     SECTION 3.6         Separability. In case any provision in this
                    Supplemental Indenture, or in the Indenture, shall be
                    invalid, illegal or unenforceable, the validity, legality
                    and enforceability of the remaining provisions shall not in
                    any way be affected or impaired thereby, it being intended
                    that all of the provisions hereof shall be enforceable to
                    the full extent permitted by law.

     SECTION 3.7         Trustee Responsibility. The Trustee assumes no
                    duties, responsibilities or liabilities by reason of this
                    Supplemental Indenture other than as set forth in the
                    Original Indenture. The Trustee assumes no responsibility
                    for the correctness of the statements herein contained,
                    which shall be taken as statements of TCI. This Supplemental
                    Indenture is executed and accepted by the Trustee subject to
                    all of the terms and conditions of its acceptance of the
                    trust under the Original Indenture, as fully as if said
                    terms and conditions were herein set forth in full.

     SECTION 3.8         Headings. The Article and Section headings of this
                    Supplemental Indenture have been inserted for convenience of
                    reference only, are not to be considered a part of this
                    Supplemental Indenture and shall in no way modify or
                    restrict any of the terms or provisions hereof.

     SECTION 3.9         Counterparts. This Supplemental Indenture may be
                    executed in counterparts, each of which shall for all
                    purposes be deemed to be an original, and all such
                    counterparts shall together constitute but one and the same
                    instrument.

                                       -5-
<PAGE>   7

     SECTION 3.10        Notices. The addresses for notices to the Company
                    and the Trustee set forth in Section 11.02 of the Original
                    Indenture shall be amended, without further action, to read
                    in their entirety as follows:

                    "If to the Company:

                           Tele-Communications, Inc.
                           9197 South Peoria Street
                           Englewood, Colorado 80112
                           Attention: Treasurer

                    If to the Trustee:

                           The Bank of New York
                           101 Barclay Street, Floor 21W
                           New York, New York 10286"

     SECTION 3.11        Governing Law. This Supplemental Indenture shall
                    be governed by and construed in accordance with the internal
                    laws of the State of New York.



                                      -6-
<PAGE>   8


          IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the day and year first above written.



                                      TELE-COMMUNICATIONS, INC.

                                      By:
                                          -------------------------------------
                                          Name:
                                          Title:


                                      THE BANK OF NEW YORK, as Trustee

                                      By:  ------------------------------------
                                           Name:
                                           Title:


                                      -7-

<PAGE>   1


                                                                     EXHIBIT 4.6


================================================================================







                            TELE-COMMUNICATIONS, INC.


                                       and


                          THE BANK OF NEW YORK, Trustee


                                ----------------



                          SECOND SUPPLEMENTAL INDENTURE
                          Dated as of February 25, 2000


              Supplement to Indenture Dated as of February 19, 1998
                               as supplemented by
             First Supplemental Indenture Dated as of March 9, 1999


                              --------------------



                          7.125% Senior Notes due 2028
                          6.375% Senior Notes due 2003




================================================================================


<PAGE>   2


     THIS SECOND SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") is made
as of February 25, 2000, between TELE-COMMUNICATIONS, INC., a Delaware
corporation ("TCI" or, the "Company"), as successor issuer, and THE BANK OF NEW
YORK, a New York banking corporation (the "Trustee"), as trustee.


                                    RECITALS

     WHEREAS, TCI and the Trustee are parties to an Indenture, dated as of
February 19, 1998, as supplemented by a First Supplemental Indenture, dated as
of March 9, 1999 (collectively, the "Original Indenture"), pursuant to which the
Company issued (as successor issuer), and the Trustee authenticated and
delivered the following securities which are, as of the date hereof, currently
outstanding (collectively, the "Securities"):

(a) $300,000,000 aggregate principal amount of the Company's 7.125% Senior Notes
due 2028; and

(b) $750,000,000 aggregate principal amount of the Company's 6.375% Senior Notes
due 2003;

     WHEREAS, the Board of Directors of TCI has determined that it is in the
best interests of TCI to convert its corporate form from a Delaware corporation
to a Delaware limited liability company pursuant to Section 266 of the Delaware
General Corporation Law and Section 18-214 of the Delaware Limited Liability
Company Act (the "Conversion");

     WHEREAS, the Board of Directors of TCI has determined that it is advisable
to amend certain provisions of the Original Indenture which may affect the
Conversion;

     WHEREAS, the Original Indenture provides that the Company and the Trustee
may amend or supplement the Original Indenture or the Securities of any series
without notice to or consent of any Holder of Securities or coupons to make any
change that, in the opinion of the Board of Directors, does not materially
adversely affect the rights of any Securityholder or the Holder of any coupon;

     WHEREAS, the Board of Directors of TCI has determined that the amendments
to the Indenture contained in this Supplemental Indenture do not materially
adversely affect the rights of any Securityholder or the Holder of any coupon;
and

     WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary action on the part of TCI.

     NOW, THEREFORE, TCI and the Trustee agree as follows for the equal and
ratable benefit of the Holders:


                                      -1-
<PAGE>   3


                                    ARTICLE I

                           DEFINITIONS; INTERPRETATION

SECTION 1.1         Definitions. Capitalized terms that are defined in the
               preamble or the recitals hereto shall have such meanings
               throughout this Supplemental Indenture. Capitalized terms used
               but not defined in this Supplemental Indenture have the meanings
               assigned thereto in the Original Indenture. The meanings assigned
               to all defined terms used in this Supplemental Indenture shall be
               equally applicable to both the singular and plural forms of such
               defined terms. The term "Indenture" as used herein means the
               Original Indenture, as amended and supplemented by this
               Supplemental Indenture, or as otherwise supplemented or amended
               from time to time by one or more indentures supplemental thereto
               or hereto entered into pursuant to the applicable provisions of
               the Indenture.

SECTION 1.2         Interpretation. References in the Original Indenture
               (including references in the Original Indenture as amended or
               supplemented hereby) to "this Indenture" (and indirect references
               such as "hereunder," "herein" and "hereof") shall be deemed
               references to the Original Indenture as amended and supplemented
               hereby. All of the covenants, agreements and provisions of this
               Supplemental Indenture shall be deemed to be and construed as
               part of the Original Indenture to the same effect as if fully set
               forth therein and shall be fully enforceable in the manner
               provided in the Original Indenture. Except as otherwise provided
               in this Supplemental Indenture, all of the covenants, agreements
               and provisions of the Original Indenture shall remain in full
               force and effect.

                                   ARTICLE II

                                   AMENDMENTS

SECTION 2.1         Amendments. The following provisions of the Original
               Indenture are hereby amended, modified, supplemented or replaced
               as follows:

     (a)            The definition of "Board of Directors" contained in Article
               One, Section 1.01 of the Original Indenture is amended to read in
               its entirety as follows: "Board of Directors means the Board of
               Directors of the Company or any authorized committee thereof, or,
               if the Company is not a corporation, the equivalent decision
               making body thereof or authorized committee thereof."


                                      -2-
<PAGE>   4


     (b)            The definition of "Officer" contained in Article One,
               Section 1.01 of the Original Indenture is amended to add the
               words "(if any)" after the words "Chairman of the Board."

     (c)            Article Four, Section 4.07 is hereby amended to replace the
               word "corporate" appearing in the heading to such section and as
               the second to the last word of such section with the word
               "legal."

     (d)            Article Five is hereby amended to replace the word
               "CORPORATION" appearing in the heading thereof with the word
               "ENTITY."

     (e)            Article Five, Section 5.01 is hereby amended to insert the
               words "or limited liability company" after each occurrence of the
               word "corporation."

     (f)            Article Five, Section 5.01 is also hereby amended to insert
               the following words as a new paragraph after the first paragraph
               thereof: "Nothing in this Indenture shall prohibit the Company
               from effecting a conversion pursuant to applicable law of the
               Company from a corporation into a limited liability company or
               from a limited liability company into a corporation, and any such
               conversion shall not be deemed to be a consolidation, merger or
               transfer subject to the requirements of the immediately preceding
               paragraph, provided, that such conversion by law shall not be
               deemed to affect any obligations or liabilities of the Company
               incurred prior to such conversion (including obligations or
               liabilities with respect to the Securities). Notice of any such
               conversion shall be promptly delivered to the Trustee."

     (g)            Article Ten, Section 10.15 is hereby amended to insert the
               words "or limited liability company" after the word "corporation"
               in clause (2) thereof.

                                   ARTICLE III

                                  MISCELLANEOUS

SECTION 3.1         Conflict with the TIA. If any provision of this Supplemental
               Indenture modifies or excludes any provision of the TIA that is
               required under such Act to be part of and govern the Indenture,
               the latter provision of the TIA shall control. If any provision
               hereof modifies or excludes any provision of the TIA that may be
               so modified or excluded, the latter provision


                                      -3-
<PAGE>   5


               of the TIA shall be deemed to apply to this Supplemental
               Indenture, as so modified or excluded, as the case may be.

SECTION 3.2         Date and Time of Effectiveness. This Supplemental Indenture
               shall become a legally effective and binding instrument at and as
               of the date hereof.

SECTION 3.3         Securities Deemed Conformed. As of the date hereof, the
               provisions of each Security then outstanding shall be deemed to
               be conformed, without the necessity for any reissuance or
               exchange of such Security or any other action on the part of the
               Holders, TCI or the Trustee, so as to reflect this Supplemental
               Indenture.

SECTION 3.4         Successors. All agreements of TCI and the Trustee in this
               Supplemental Indenture and in the Indenture shall bind their
               respective successors.

SECTION 3.5         Benefits of Supplemental Indenture. Nothing in this
               Supplemental Indenture, express or implied, shall give to any
               person, other than the parties hereto and their successors
               hereunder, any Agent, Authenticating Agent and the Holders, any
               benefit or any legal or equitable right, remedy or claim under
               this Supplemental Indenture or the Indenture.

SECTION 3.6         Separability. In case any provision in this Supplemental
               Indenture, or in the Indenture, shall be invalid, illegal or
               unenforceable, the validity, legality and enforceability of the
               remaining provisions shall not in any way be affected or impaired
               thereby, it being intended that all of the provisions hereof
               shall be enforceable to the full extent permitted by law.

SECTION 3.7         Trustee Responsibility. The Trustee assumes no duties,
               responsibilities or liabilities by reason of this Supplemental
               Indenture other than as set forth in the Original Indenture. The
               Trustee assumes no responsibility for the correctness of the
               statements herein contained, which shall be taken as statements
               of TCI. This Supplemental Indenture is executed and accepted by
               the Trustee subject to all of the terms and conditions of its
               acceptance of the trust under the Original Indenture, as fully as
               if said terms and conditions were herein set forth in full.

SECTION 3.8         Headings. The Article and Section headings of this
               Supplemental Indenture have been inserted for convenience of
               reference only, are not to be considered a part of this
               Supplemental Indenture and shall in no way modify or restrict any
               of the terms or provisions hereof.


                                      -4-
<PAGE>   6


SECTION 3.9         Counterparts. This Supplemental Indenture may be executed in
               counterparts, each of which shall for all purposes be deemed to
               be an original, and all such counterparts shall together
               constitute but one and the same instrument.

SECTION 3.10        Notices. The addresses for notices to the Company and the
               Trustee set forth in Section 11.02 of the Original Indenture
               shall be amended, without further action, to read in their
               entirety as follows:

               "If to the Company:

                       Tele-Communications, Inc.
                       9197 South Peoria Street
                       Englewood, Colorado 80112
                       Attention: Treasurer

               If to the Trustee:

                      The Bank of New York
                      101 Barclay Street, Floor 21W
                      New York, New York 10286"

SECTION 3.11        Governing Law. This Supplemental Indenture shall be governed
               by and construed in accordance with the internal laws of the
               State of New York.


                                      -5-
<PAGE>   7


     IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the day and year first above written.



                                             TELE-COMMUNICATIONS, INC.

                                             By:
                                                --------------------------------
                                                 Name:
                                                 Title:


                                             THE BANK OF NEW YORK, as Trustee

                                             By:
                                                --------------------------------
                                                 Name:
                                                 Title:


                                      -6-


<PAGE>   1
                                                                     EXHIBIT 4.7

===============================================================================



                            TELE-COMMUNICATIONS, INC.


                                       and


                  STATE STREET BANK AND TRUST COMPANY, Trustee

                               ------------------

                          THIRD SUPPLEMENTAL INDENTURE
                          Dated as of February 25, 2000


                Supplement to Indenture Dated as of July 26, 1993
                               as supplemented by
         First Supplemental Indenture Dated as of September 13, 1994 and
             Second Supplemental Indenture Dated as of March 9, 1999

                               ------------------

                          7.250% Senior Notes due 2005
                        7.875% Senior Debentures due 2013
                          8.650% Senior Notes due 2004
                          8.000% Senior Notes due 2005
                        8.750% Senior Debentures due 2015




===============================================================================


<PAGE>   2


         THIS THIRD SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") is
made as of February 25, 2000, between TELE-COMMUNICATIONS, INC., a Delaware
corporation ("TCI" or the "Company"), as successor issuer, and STATE STREET BANK
AND TRUST COMPANY, a Massachusetts Trust Company (the "Trustee"), as trustee.


                                    RECITALS

         WHEREAS, TCI and the Trustee (as successor trustee to Shawmut Bank
Connecticut, National Association ("Shawmut")), are parties to an Indenture,
dated as of July 26, 1993, as supplemented by the First Supplemental Indenture,
dated as of September 13, 1994, and the Second Supplemental Indenture, dated as
of March 9, 1999 (together, the "Original Indenture"), pursuant to which the
Company issued, and Shawmut authenticated and delivered the following securities
which are, as of the date hereof, currently outstanding (collectively, the
"Securities"):

(a) $300 million aggregate principal amount of the Company's 7.250% Senior Notes
    due 2005;

(b) $550 million aggregate principal amount of the Company's 7.875% Senior
    Debentures due 2013;

(c) $300 million aggregate principal amount of the Company's 8.650% Senior Notes
    due 2004;

(d) $350 million aggregate principal amount of the Company's 8.000% Senior Notes
    due 2005; and

(e) $750 million aggregate principal amount of the Company's 8.750% Senior
    Debentures due 2015;

         WHEREAS, the Board of Directors of TCI has determined that it is in the
best interests of TCI to convert its corporate form from a Delaware corporation
to a Delaware limited liability company pursuant to Section 266 of the Delaware
General Corporation Law and Section 18-214 of the Delaware Limited Liability
Company Act (the "Conversion");

         WHEREAS, the Board of Directors of TCI has determined that it is
advisable to amend certain provisions of the Original Indenture which may affect
the Conversion;

         WHEREAS, the Original Indenture provides that the Company and the
Trustee may amend or supplement the Original Indenture or the Securities of any
series without notice to or consent of any Holder of Securities or coupons to
make any change that, in the opinion of the Board of Directors, does not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon;

         WHEREAS, the Board of Directors of TCI has determined that the
amendments to the Indenture contained in this Supplemental Indenture do not
materially adversely affect the rights of any Securityholder or the Holder of
any coupon; and

         WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary action on the part of TCI.


                                      - 1 -



<PAGE>   3



         NOW, THEREFORE, TCI and the Trustee agree as follows for the equal and
ratable benefit of the Holders:

                                    ARTICLE I

                           DEFINITIONS; INTERPRETATION

         SECTION 1.01 Definitions. Capitalized terms that are defined in the
preamble or the recitals hereto shall have such meanings throughout this
Supplemental Indenture. Capitalized terms used but not defined in this
Supplemental Indenture have the meanings assigned thereto in the Original
Indenture. The meanings assigned to all defined terms used in this Supplemental
Indenture shall be equally applicable to both the singular and plural forms of
such defined terms. The term "Indenture" as used herein means the Original
Indenture, as amended and supplemented by this Supplemental Indenture, or as
otherwise supplemented or amended from time to time by one or more indentures
supplemental thereto or hereto entered into pursuant to the applicable
provisions of the Indenture.

         SECTION 1.02 Interpretation. References in the Original Indenture
(including references in the Original Indenture as amended or supplemented
hereby) to "this Indenture" (and indirect references such as "hereunder,"
"herein" and "hereof") shall be deemed references to the Original Indenture as
amended and supplemented hereby. All of the covenants, agreements and provisions
of this Supplemental Indenture shall be deemed to be and construed as part of
the Original Indenture to the same effect as if fully set forth therein and
shall be fully enforceable in the manner provided in the Original Indenture.
Except as otherwise provided in this Supplemental Indenture, all of the
covenants, agreements and provisions of the Original Indenture shall remain in
full force and effect.

                                   ARTICLE II

                                   AMENDMENTS

         SECTION 2.01 Amendments. The following provisions of the Original
Indenture are hereby amended, modified, supplemented or replaced as follows:

                  (a) The definition of "Board of Directors" contained in
         Article One, Section 1.01 of the Original Indenture is amended to read
         in its entirety as follows: "Board of Directors means the Board of
         Directors of the Company or any authorized committee thereof, or, if
         the Company is not a corporation, the equivalent decision making body
         thereof or authorized committee thereof."


                                      - 2 -



<PAGE>   4



                  (b) The definition of "Officer" contained in Article One,
         Section 1.01 of the Original Indenture is amended to add the words "(if
         any)" after the words "Chairman of the Board."

                  (c) The definition of "Subsidiary" contained in Article One,
         Section 1.01 of the Original Indenture is amended to add the words ",
         partnership, limited liability company, association or other business
         entity" after the occurrence of the word "corporation", to add the
         words "(or other voting securities)" after each occurrence of the words
         "voting stock", and to add the words "(or other securities)" after the
         words "capital stock."

                  (d) Article Four, Section 4.08 is hereby amended to replace
         the word "corporate" appearing in the heading to such section and as
         the second to the last word of such section with the word "legal."

                  (e) Article Five is hereby amended to replace the word
         "CORPORATION" appearing in the heading thereof with the word "ENTITY."

                  (f) Article Five, Section 5.01 is hereby amended to insert the
         words "or limited liability company" after each occurrence of the word
         "corporation."

                  (g) Article Five, Section 5.01 is also hereby amended to
         insert the following words as a new paragraph after the first paragraph
         thereof: "Nothing in this Indenture shall prohibit the Company from
         effecting a conversion pursuant to applicable law of the Company from a
         corporation into a limited liability company or from a limited
         liability company into a corporation, and any such conversion shall not
         be deemed to be a consolidation, merger or transfer subject to the
         requirements of the immediately preceding paragraph, provided, that
         such conversion by law shall not be deemed to affect any obligations or
         liabilities of the Company incurred prior to such conversion (including
         obligations or liabilities with respect to the Securities). Notice of
         any such conversion shall be promptly delivered to the Trustee."

                  (h) Article Ten, Section 10.15 is hereby amended to insert the
         words "or limited liability company" after the word "corporation" in
         clause (2) thereof.

                  (i) Article Ten, Section 10.16 is hereby amended to insert the
         words "or limited liability company" after each occurrence of the word
         "corporation."


                                      - 3 -



<PAGE>   5


                                   ARTICLE III

                                  MISCELLANEOUS


         SECTION 3.01 Conflict with the TIA. If any provision of this
Supplemental Indenture modifies or excludes any provision of the TIA that is
required under such Act to be part of and govern the Indenture, the latter
provision of the TIA shall control. If any provision hereof modifies or excludes
any provision of the TIA that may be so modified or excluded, the latter
provision of the TIA shall be deemed to apply to this Supplemental Indenture, as
so modified or excluded, as the case may be.

         SECTION 3.02 Date and Time of Effectiveness. This Supplemental
Indenture shall become a legally effective and binding instrument at and as of
the date hereof.

         SECTION 3.03 Securities Deemed Conformed. As of the date hereof, the
provisions of each Security then outstanding shall be deemed to be conformed,
without the necessity for any reissuance or exchange of such Security or any
other action on the part of the Holders, TCI or the Trustee, so as to reflect
this Supplemental Indenture.

         SECTION 3.04 Successors. All agreements of TCI and the Trustee in this
Supplemental Indenture and in the Indenture shall bind their respective
successors.

         SECTION 3.05 Benefits of Supplemental Indenture. Nothing in this
Supplemental Indenture, express or implied, shall give to any person, other than
the parties hereto and their successors hereunder, any Agent and the Holders,
any benefit or any legal or equitable right, remedy or claim under this
Supplemental Indenture or the Indenture.

         SECTION 3.06 Separability. In case any provision in this Supplemental
Indenture, or in the Indenture, shall be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby, it being intended that all of the
provisions hereof shall be enforceable to the full extent permitted by law.

         SECTION 3.07 Trustee Responsibility. The Trustee assumes no duties,
responsibilities or liabilities by reason of this Supplemental Indenture other
than as set forth in the Original Indenture. The Trustee assumes no
responsibility for the correctness of the statements herein contained, which
shall be taken as statements of TCI. This Supplemental Indenture is executed and
accepted by the Trustee subject to all of the terms and conditions of its
acceptance of the trust under the Original Indenture, as fully as if said terms
and conditions were herein set forth in full.

         SECTION 3.08 Headings. The Article and Section headings of this
Supplemental Indenture have been inserted for convenience of reference only, are
not to be considered a part of this Supplemental Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.


                                      - 4 -



<PAGE>   6



         SECTION 3.09 Counterparts. This Supplemental Indenture may be executed
in counterparts, each of which shall for all purposes be deemed to be an
original, and all such counterparts shall together constitute but one and the
same instrument.

         SECTION 3.10 Notices. The addresses for notices to the Company and the
Trustee set forth in Section 11.02 of the Original Indenture shall be amended,
without further action, to read in their entirety as follows:

                  "If to the Company:

                           Tele-Communications, Inc.
                           9197 South Peoria Street
                           Englewood, Colorado 80112
                           Attention: Treasurer

                  If to the Trustee:

                           State Street Bank and Trust Company
                           Goodwin Square
                           225 Asylum Street
                           23rd Floor
                           Hartford, Connecticut 06103
                           Attention:  Corporate Trust Department"

         SECTION 3.11 Governing Law. This Supplemental Indenture shall be
governed by and construed in accordance with the internal laws of the State of
New York.

                                      - 5 -



<PAGE>   7


         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the day and year first above written.


                                     TELE-COMMUNICATIONS, INC.

                                     By:
                                        ---------------------------------------
                                        Name:
                                        Title:


                                     STATE STREET BANK AND TRUST COMPANY,
                                               as Trustee

                                     By:
                                        ---------------------------------------
                                        Name:
                                        Title:



                                      - 6 -








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