DIGITAL TRANSMISSION SYSTEMS INC \DE\
SC 13D/A, EX-10.11, 2000-11-14
COMMUNICATIONS EQUIPMENT, NEC
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                                                                      EXHIBIT 11

                        PURCHASE AND ASSIGNMENT AGREEMENT



June 7, 2000

Lance Weller
Margaret Weller
3400 River Green Ct.
Duluth, Georgia 30096

Dear Sirs:

RE:  DIGITAL TRANSMISSION SYSTEMS, INC.
     ----------------------------------

This letter sets forth the agreement between Wi-LAN Inc. ("WI-LAN") and Lance
Weller and Margaret Weller (collectively, the "SELLERS") with respect to the
purchase by Wi-LAN from the Sellers of the right, title and interest of the
Sellers in and to the Remaining Merger Consideration (as herein defined) payable
to the Sellers pursuant to the agreement and plan of merger ("ORIGINAL MERGER
AGREEMENT") dated as of the 29th day of February, 2000 entered into by and among
Digital Transmission Systems, Inc. ("DTS"), ICT Acquisition Corp. ("ICT"),
Telcor Communications, Inc. ("TELCOR") and the Sellers, as amended by amendment
no. 1 ("AMENDMENT NO. 1") to the agreement and plan of merger, dated as of March
31, 2000 entered into by and among DTS, ICT, Telcor and the Sellers and
amendment no. 2 ("AMENDMENT No. 2") to the agreement and plan of merger dated as
of June 7, 2000 entered into by and among DTS, ICT, Telcor and the Sellers
(collectively, the "MERGER AGREEMENT") to the extent relating to the Remaining
Merger Consideration. For these purposes, "REMAINING MERGER CONSIDERATION" means
an undivided thirty and one-half percent (30.5%) of the Merger Consideration, as
defined in the Original Merger Agreement as amended by Amendment No. 1, which as
of June 2, 2000 remained unpaid to the Sellers, being an undivided thirty and
one-half percent (30.5%) of those amounts described in paragraph II of Schedule
3.2 and Schedule 3.4 of the Original Merger Agreement as amended by Amendment
No. 1. All capitalized words and expressions used in this letter agreement and
not defined herein have the meanings ascribed to them in the Merger Agreement.

1.       Subject to the terms and conditions of this agreement, the Sellers
         agree to sell to Wi-LAN and Wi-LAN agrees to purchase from the Sellers,
         all of the Sellers' right, title and interest in and to the Remaining
         Merger Consideration and all of the Sellers' right, title, interest,
         benefit and advantage to be derived from and under the Merger Agreement
         to the extent relating to the Remaining Merger Consideration including,
         without limitation, the benefit of any and all powers, covenants,
         terms, agreements and provisions of and contained in the Merger
         Agreement relating to the Remaining Merger Consideration with full
         power and authority of Wi-LAN to use, in its sole discretion, the names
         of the Sellers, their successors and assigns, to enforce the
         performance and observance of DTS under the Merger Agreement to the
         extent relating to the Remaining Merger Consideration pursuant to the
         terms thereof. For greater certainty, Wi-LAN shall share pro rata to
         its interest in the Remaining Merger Consideration in any registration
         rights of the Sellers pursuant to the first amended and restated
         registration rights agreement (the "FIRST AMENDED AND RESTATED
         REGISTRATION RIGHTS AGREEMENT") dated June 7, 2000 among DTS and the
         Sellers, as such agreement is amended from time to time, with respect
         to the DTS Shares under the Remaining Merger Consideration.

         The aggregate consideration payable, on the Closing Date (as herein
         defined), by Wi-LAN for the Remaining Merger Consideration is U.S.$6.1
         million payable (i) as to U.S.$500,000 in cash, and (ii) as to U.S.$5.6
         million by the issue of the right (the "JULY

<PAGE>

                                        2

         RIGHT"), attached as SCHEDULE "A" hereto, to acquire the warrant (the
         "JULY WARRANT") attached as Exhibit I thereto, and the right (the
         "AUGUST RIGHT"), attached as SCHEDULE "B" hereto, to acquire the option
         (the "AUGUST OPTION"), attached as Exhibit I thereto, to acquire the
         warrant (the "OCTOBER WARRANT") attached as Exhibit II thereto. The
         July Right and the August Right are collectively referred to herein as
         the "RIGHTS" and the July Warrant and the October Warrant are
         collectively referred to herein as the "WARRANTS". The Rights,
         Warrants, August Option and Wi-LAN common shares issuable upon exercise
         of the Warrants are collectively referred to herein as the "WI-LAN
         SECURITIES".

         It is acknowledged and agreed that neither the execution nor the
         enforcement of this agreement shall make Wi-LAN liable or responsible,
         in any manner whatsoever, for the observance or performance of any of
         the Sellers' covenants or other obligations under the Merger Agreement
         or for the payment of any monies payable by the Sellers, or either of
         them, thereunder or of releasing the Sellers, or either of them, from
         their obligations thereunder.

         Wi-LAN will use its reasonable best efforts to qualify the distribution
         of the July Warrant upon exercise of the July Right pursuant to a
         prospectus filed in the Province of Alberta and, if required in order
         to make the Wi-LAN common shares (the "WI-LAN SHARES") issuable upon
         exercise of the July Warrant freely tradable on The Toronto Stock
         Exchange (the "TSE"), in the Province of Ontario, on or before the
         thirtieth (30th) day (the "QUALIFICATION DATE") following the Closing
         Date (as hereinafter defined). In the event that, despite the
         reasonable best efforts of Wi-LAN, it is unable to so qualify the
         distribution of the July Warrant issuable upon exercise of the July
         Right on or before the Qualification Date, then, in such event, Wi-LAN
         shall issue to the Seller's an aggregate number of Wi-LAN Shares equal
         to 10% of the number of Wi-LAN Shares issuable upon exercise of the
         July Warrant as at the Qualification Date. In the event that despite
         the reasonable best efforts of Wi-LAN, it is unable to qualify the
         distribution of the July Warrant on or before August 15, 2000, then, in
         such event, Wi-LAN shall issue to the Seller's an aggregate number of
         Wi-LAN Shares equal to 10% of the number of Wi-LAN Shares issuable upon
         exercise of the July Warrant as at August 15, 2000. In the event that,
         despite the reasonable best efforts of Wi-LAN, it is unable to qualify
         the distribution of the July Warrant on or before September 15, 2000,
         then, in such event, Wi-LAN shall issue to the Seller's an aggregate
         number of Wi-LAN Shares equal to 5% of the number of Wi-LAN Shares
         issuable upon exercise of the July Warrant as at September 15, 2000.

         Wi-LAN will use its reasonable best efforts to qualify the distribution
         of the August Option upon exercise of the August Right pursuant to a
         prospectus filed in the Province of Alberta and, if required in order
         to make the Wi-LAN Shares issuable upon exercise of the October Warrant
         freely tradable on the TSE, in the Province of Ontario, on or before
         October 30, 2000. To the extent that, despite the reasonable best
         efforts of Wi-LAN, it is unable to qualify the distribution of the
         August Option on or before the foregoing qualification date, then,
         thereafter, Wi-LAN shall continue to use its reasonable best efforts to
         so qualify the distribution.

         The July Warrant and the October Warrant are redeemable, in whole or in
         part, at the sole option of Wi-LAN at any time, and from time to time,
         prior to the full exercise thereof for a price equal to the U.S. dollar
         stated value of the respective warrant remaining outstanding.

2.       The closing of the transactions contemplated hereby will be completed
         at the offices of Wi-LAN's counsel, Burnet, Duckworth & Palmer, 1400,
         350 - 7th Avenue S.W., Calgary, Alberta, T2P 3N9, at 2:00 p.m. (Calgary
         time), or such other time as the parties may agree (the "CLOSING
         TIME"), on June 16, 2000, or such other date as the parties may agree
         (the "CLOSING DATE").

<PAGE>

                                        3

3.       As an inducement to Wi-LAN to enter into this agreement and consummate
         the transactions contemplated hereby, each of the Sellers jointly and
         severally represents and warrants to Wi-LAN, as of the date of
         execution of this agreement and again as of the Closing Time, as
         follows:

a.       Each of the Sellers has the power and authority to enter into this
         agreement and the other agreements or documents contemplated hereby to
         be executed and delivered in connection with the transactions
         contemplated by this agreement at or before the Closing Time
         (collectively, the "OTHER AGREEMENTS") to which he or she is to become
         a party pursuant hereto and perform his or her obligations hereunder
         and thereunder.

b.       This agreement has been duly executed and delivered by and constitutes
         the legal, valid and binding obligation of each of the Sellers,
         enforceable against him or her in accordance with its terms. Each Other
         Agreement to which any Seller is to become a party pursuant to the
         provisions hereof, when executed and delivered by such Seller, will
         constitute the legal, valid and binding obligation of the Seller,
         enforceable against him or her in accordance with the terms of such
         Other Agreement. All actions contemplated by this section and this
         agreement have been duly and validly authorized by all necessary
         proceedings by each of the Sellers.

c.       Neither the execution and delivery of this agreement or any Other
         Agreement to which any Seller is or is to become a party, the
         consummation of the transactions contemplated hereby or thereby nor the
         compliance with or fulfillment of the terms, conditions or provisions
         hereof or thereof by the Sellers, or either of them, will: (i) conflict
         with, result in a breach of, constitute a default or an event of
         default (or an event that might, with the passage of time or the giving
         of notice or both, constitute a default or event of default) under any
         of the terms of, result in the termination of, result in the loss of
         any right under, or give to any other person the right to cause such
         termination of or loss under the Merger Agreement or the Remaining
         Merger Consideration including, without limitation, any contract,
         agreement or instrument to which any Seller is a party or by which any
         of its assets may be bound or affected; (ii) violate any applicable
         laws or violate any judgment or order of any governmental authority to
         which either of the Sellers is subject or by which the Remaining Merger
         Consideration or the Merger Agreement may be bound or affected; or
         (iii) result in the creation or imposition of any liability, debt,
         mortgage, deed of trust, pledge, security interest, encumbrance,
         option, right of first refusal, agreement of sale, adverse claim,
         easement, lien, assessment, restrictive covenant, encroachment, burden
         or charge of any kind or nature whatsoever or any items similar or
         related to the foregoing (collectively, "ENCUMBRANCE") upon the
         Remaining Merger Consideration or the Merger Agreement or give to any
         other person any interest or right therein.

d.       Except for the Consent, Acknowledgment and Novation Agreement to be
         executed by DTS, ICT, Telcor and the Sellers, no consent, approval, or
         authorization of, or registration or filing with, any natural person,
         corporation, association, partnership, limited liability company,
         trust, joint venture, unincorporated organization, business, any other
         legal entity or a Governmental Body (as herein defined) (collectively,
         "PERSON") is required in connection with the execution or delivery by
         the Sellers or either of them, of this agreement or any of the Other
         Agreements to which either of them is or is to become a party pursuant
         to the provisions hereof or in connection with the consummation by
         Sellers, or, either of them, of the transactions contemplated hereby or
         thereby.

e.       Except for the threatened claim of David Straden against the Sellers
         and Telcor to which the Sellers owe indemnification pursuant to Section
         9.2(c) of the Merger Agreement, no action, suit, investigation, claim
         or proceeding of any nature or kind whatsoever whether civil, criminal
         or administrative, by or before any court, government (federal, state,
         provincial, local or foreign), department, commission, board, bureau,
         agency, official or other regulatory, administrative or governmental
         authority or instrumentality

<PAGE>

                                        4

         ("GOVERNMENTAL BODY") or arbitrator is pending or, to the knowledge of
         the Sellers, threatened against or affecting the Sellers in connection
         with the Remaining Merger Consideration or the Merger Agreement or any
         of the transactions contemplated by this agreement and to the knowledge
         of the Sellers, there is no basis for any such litigation. There is
         presently no outstanding judgment, decree or order of any Governmental
         Body against or affecting the Sellers in connection with the Remaining
         Merger Consideration or the Merger Agreement or any other transactions
         contemplated by this agreement or any Other Agreement.

f.       Neither of the Sellers has employed any broker or finder or incurred
         any liability for any brokerage fee, commission or finder's fee in
         connection with any of the transactions contemplated hereby or by any
         Other Agreement for which Wi-LAN or DTS may have any responsibility or
         liability.

g.       The Merger Agreement was duly executed and delivered by the Sellers,
         and the Original Merger Agreement, Amendment No. 1 and Amendment No. 2
         were duly executed and delivered by Telcor and constitutes their
         respective legal, valid and binding obligations, enforceable in
         accordance with its terms; and all material conditions precedent to the
         consummation of the transactions contemplated by the Merger Agreement
         have been satisfied or waived by that party for whom the conditions
         existed and the transaction of merger contemplated thereby has been
         completed subject only to the payment of the Merger Consideration, as
         defined in the Merger Agreement, which as of the date hereof remains
         unpaid to the Sellers, being those amounts described in paragraph II of
         Schedule 3.2 and Schedule 3.4 of the Merger Agreement.

h.       A true and correct copy of the Merger Agreement is attached as SCHEDULE
         "C" hereto.

i.       The Merger Agreement is in full force and effect and except for
         Amendment No. 1 and Amendment No. 2 included in Schedule "C", the
         Merger Agreement has in no way been modified, amended or altered.

j.       The First Amended and Restated Registration Rights Agreement is in full
         force and effect and has in no way been modified, amended or altered.

k.       The Sellers are the absolute legal and beneficial owners of the
         Remaining Merger Consideration and the Merger Agreement free and clear
         of all Encumbrances and have good and sufficient power, authority and
         right to transfer the legal and beneficial title to the Remaining
         Merger Consideration and the Merger Agreement (to the extent provided
         for herein) to Wi-LAN free and clear of all Encumbrances.

l.       The obligations of DTS in respect of the Remaining Merger Consideration
         have not been extinguished, compromised or settled in whole or in part
         and the entire Remaining Merger Consideration remains outstanding and
         is payable to the Sellers in accordance with the terms of the Merger
         Agreement.

m.       Neither the Remaining Merger Consideration nor the Merger Agreement or
         any of the Sellers' rights or interests therein (except for certain DTS
         shares, representing Merger Consideration issued pursuant to Paragraph
         I of the Merger Agreement, which were pledged by the Sellers to PNC
         Bank) have been previously assigned or transferred to any other Person
         and no Person has any agreement, option, right or privilege (including,
         without limitation, whether by law, pre-emptive right, contract or
         otherwise) to acquire any rights or interests therein nor any
         agreement, option, right or privilege capable of becoming any such
         agreement, option, right or privilege.

<PAGE>

                                        5

n.       The Sellers will not resell the Wi-LAN Securities received hereunder
         except in accordance with the provisions of applicable securities
         legislation and the rules of the TSE.

o.       The Sellers have executed this agreement in the United States, and have
         concurrently executed and delivered the representation letter attached
         as SCHEDULE "D" to this agreement.

p.       If required by applicable securities legislation, policy or order or by
         any securities commission, stock exchange or other regulatory
         authority, the Sellers, at the sole cost and expense of Wi-LAN
         (including the payment of reasonable attorney's fees of counsel for the
         Sellers), will execute, deliver, file and otherwise assist Wi-LAN in
         filing, such reports, undertakings and other documents with respect to
         the issue of the Wi-LAN Securities to the Sellers.

q.       The obligation of DTS to pay the Remaining Merger Consideration is not
         subject to any defense, counterclaim or set-off, whether at law or in
         equity.

4.       As an inducement to the Sellers to enter into this agreement and
         consummate the transactions contemplated hereby, Wi-LAN represents and
         warrants to the Sellers, as of the date of execution of this agreement
         and again as of the Closing Time, as follows:

a.       Wi-LAN has the power and authority to enter into this agreement and the
         Other Agreements to which it is to become a party pursuant hereto and
         perform its obligations hereunder and thereunder.

b.       This agreement has been duly executed and delivered by and constitutes
         the legal, valid and binding obligation of Wi-LAN, enforceable against
         it in accordance with its terms. Each Other Agreement to which Wi-LAN
         is to become a party pursuant to the provisions hereof, when executed
         and delivered by Wi-LAN, will constitute the legal, valid and binding
         obligation of Wi-LAN, enforceable against it in accordance with the
         terms of such Other Agreement. All actions contemplated by this section
         and this agreement have been duly and validly authorized by all
         necessary proceedings by Wi-LAN.

c.       Neither the execution and delivery of this agreement or any Other
         Agreement to which Wi-LAN is or is to become a party, the consummation
         of the transactions contemplated hereby or thereby nor the compliance
         with or fulfillment of the terms, conditions or provisions hereof or
         thereof by Wi-LAN, will: (i) conflict with, result in a breach of,
         constitute a default or an event of default (or an event that might,
         with the passage of time or the giving of notice or both, constitute a
         default or event of default) under any of the terms of, result in the
         termination of, result in the loss of any right under, or give to any
         other person the right to cause such termination of or loss under any
         contract, agreement or instrument to which Wi-LAN is a party or by
         which any of its assets may be bound or affected; (ii) violate any
         applicable laws or violate any judgment or order of any governmental
         authority to which Wi-LAN is subject or by which the Wi-LAN Securities
         may be bound or affected; (iii) result in the creation or imposition of
         any Encumbrance upon the Wi-LAN Securities or give to any other person
         any interest or right therein.

d.       Except for the TSE and filings under applicable securities laws, no
         consent, approval, or authorization of, or registration or filing with,
         any person is required in connection with the execution or delivery by
         Wi-LAN of this agreement or any of the Other Agreements to which it is
         or is to become a party pursuant to the provisions hereof or in
         connection with the consummation by Wi-LAN of the transactions
         contemplated hereby or thereby.

<PAGE>

                                        6

e.       Wi-LAN has not employed any broker or finder or incurred any liability
         for any brokerage fee, commission or finder's fee in connection with
         any of the transactions contemplated hereby or by any Other Agreement
         for which the Sellers may have any responsibility or liability.

f.       The information and statements set forth in the documents and
         information filed by Wi-LAN with the securities commissions or similar
         regulatory authorities in Canada (the "PUBLIC RECORD"), as it relates
         to Wi-LAN, were true, correct and complete in all material respects and
         did not contain any material misrepresentation, as of the respective
         dates of such information or statements and no material change has
         occurred in relation to Wi-LAN which is not disclosed in the Public
         Record.

g.       The Wi-LAN Shares issuable upon exercise of the Warrants which in turn
         are issuable upon exercise of the Rights issuable pursuant hereto, when
         issued, will be issued as fully paid and non-assessable common shares
         in the capital of Wi-LAN.

h.       Wi-LAN is a reporting issuer in good standing in the provinces of
         Alberta and Ontario and is a "qualifying issuer" within the meaning of
         that term under the AIberta Securities Commission Rule 45-501. Wi-LAN
         covenants unto the Sellers that it will remain a reporting issuer in
         said provinces and in good standing so long as the Warrants are
         outstanding.

i.       Wi-LAN is an "accredited investor" within the meaning of Rule 501 of
         Regulation D under the Securities Act of 1933, as amended.

5.       The obligation of the Sellers to complete the transactions contemplated
         hereby shall be subject to:

a.       All representations and warranties of Wi-LAN made in this agreement
         being true and correct in all material respects at the Closing Time and
         with the same effect as if made at and as of the Closing Time, and
         Wi-LAN having performed or complied with, in all material respects, all
         of its obligations, covenants and agreements hereunder.

b.       Receipt of all requisite regulatory approvals and third party consents
         and DTS board of directors' approval.

c.       The Sellers shall have received the opinion of Burnet, Duckworth &
         Palmer, counsel for Wi-LAN, dated the Closing Date, addressed to the
         Sellers, in form and substance satisfactory to the Sellers' counsel,
         acting reasonably, but including, without limitation, an opinion on the
         applicable holding period on the Wi-LAN Securities.

d.       The Wi-LAN Shares issuable to the Sellers upon exercise of the Warrants
         shall have been conditionally approved for listing on the TSE, subject
         only to the filing of customary documents with the TSE.

e.       The Sellers shall have received a Consent, Acknowledgment and Novation
         Agreement executed by DTS, ICT, Telcor and the Sellers, in form and
         substance reasonably satisfactory to the Sellers' counsel.

f.       Amendment No. 2 shall be executed and delivered by DTS, ICT and Telcor.

g.       Such conditions are for the sole benefit of the Sellers and may be
         waived by the Sellers in whole or in part.

<PAGE>

                                        7

6.       The obligation of Wi-LAN to complete the purchase of the Remaining
         Merger Consideration hereunder shall be subject to:

a.       All representations and warranties of the Sellers made in this
         agreement being true and correct in all material respects at the
         Closing Time and with the same effect as if made at and as of the
         Closing Time, and the Sellers having performed or complied with, in all
         material respects, all of their obligations, covenants and agreements
         hereunder.

b.       Receipt of all requisite regulatory approvals and third party consents
         (including, without limitation, the TSE) and DTS board of directors'
         approval.

c.       Wi-LAN shall have received the opinion of Schweber, Izenson & Anderson,
         LLP, counsel for the Sellers dated the Closing Date, addressed to
         Wi-LAN, in form and substance satisfactory to Wi-LAN's counsel, acting
         reasonably.

d.       Wi-LAN shall have received a Consent, Acknowledgment and Novation
         Agreement executed by DTS, ICT, Telcor and the Sellers, in form and
         substance reasonably satisfactory to Wi-LAN's counsel.

e.       Wi-LAN shall have received Amendment No. 2 executed by DTS, ICT, Telcor
         and the Sellers, in form and substance reasonably satisfactory to
         Wi-LAN's counsel.

f.       Wi-LAN shall have received the First Amended and Restated Registration
         Rights Agreement executed by DTS and the Sellers, in form and substance
         reasonably Satisfactory to Wi-LAN's counsel.

g.       All reasonably necessary steps and proceedings shall have been taken to
         allow the Remaining Merger Consideration to be duly transferred from
         the Sellers to Wi-LAN, subject to applicable securities laws, and to
         vest in Wi-LAN good and marketable title to the Remaining Merger
         Consideration free and clear of any Encumbrances, voting trusts,
         unanimous or other shareholder agreements, proxies and other interests,
         claims or demands of every kind or nature whatsoever other than the
         First Amended and Restated Registration Rights Agreement referenced in
         subparagraph 3(j) above.

         Such conditions are for the sole benefit of Wi-LAN and may be waived by
         Wi-LAN in whole or in part.

7.       SELLERS' INDEMNITY

a.       The Sellers' shall jointly and severally covenant and agree to
         indemnify and save Wi-LAN harmless against and from all liabilities,
         claims, demands, losses, costs (including, without limitation, legal
         fees and disbursements on a full indemnity basis), damages and expenses
         to which Wi-LAN may be subject or which Wi-LAN may suffer or incur,
         whether under the provisions of any Statute or otherwise, in any way
         caused by, or arising directly or indirectly from or in consequence of
         any breach of, default under or non-compliance by the Sellers with any
         representation, warranty, term, covenant or condition of this agreement
         or in any certificate or other document delivered by or on behalf of
         the Sellers hereunder or pursuant hereto.

b.       The rights and remedies of Wi-LAN set forth in subparagraph 7(a) are to
         the fullest extent possible in law cumulative and not alternative and
         the election by Wi-LAN to exercise any such right or remedy shall not
         be, and shall not be deemed to be, a waiver of any other rights and
         remedies. Wi-LAN shall not be obligated to pursue any claim or remedy
         against any third party including, without limitation, DTS, ICT or
         Telcor before being entitled to obtain full indemnification from the
         Sellers pursuant to subparagraph 7(a).

<PAGE>

                                        8

         Provided, however, that the indemnification given hereunder shall be
         limited to no more than the consideration actually received by the
         Sellers from Wi-LAN.

8.       WI-LAN INDEMNITY

a.       Wi-LAN shall indemnify and save the Sellers harmless against and from
         all liabilities, claims, demands, losses, costs (including, without
         limitation, legal fees and disbursements on a full indemnity basis),
         damages and expenses to which the Sellers may be subject or which the
         Sellers may suffer or incur, whether under the provisions of any
         statute or otherwise, in any way caused by, or arising directly or
         indirectly from or in consequence of any breach of, default under or
         non-compliance by Wi-LAN with any representation, warranty, term,
         covenant or condition of this agreement or in any certificate or other
         document delivered by or on behalf of Wi-LAN hereunder or pursuant
         hereto.

b.       The rights and remedies of the Sellers set forth in subparagraph 8(a)
         are to the fullest extent possible in law cumulative and not
         alternative and the election by the Sellers to exercise any such right
         or remedy shall not be, and shall not be deemed to be, a waiver of any
         other rights and remedies. The Sellers shall not be obligated to pursue
         any claim or remedy against any third party before being entitled to
         obtain full indemnification from Wi-LAN pursuant to subparagraph 8(a).
         Provided, however, that the indemnification given hereunder shall be
         limited to no more than the consideration actually received by Wi-LAN
         from the Sellers.

9.       The parties will advise each other and obtain the other party's
         approval in advance of any public statements which they propose to make
         in respect of the transaction contemplated hereby, provided that no
         party shall be prevented from making any disclosure or statement which
         it is required to make by law or regulation or any rule of any stock
         exchange or similar organization by which it is bound.

10.      Whether or not the transactions contemplated hereby are consummated,
         each of the parties will pay its own costs and expenses incurred in
         connection with the preparation and negotiation of this definitive
         agreement and any due diligence investigation.

11.      Time shall be of the essence of this agreement.

12.      Any notice or other communication to be given in connection with this
         agreement shall be given in writing and shall be given by personal
         delivery or sent by facsimile transmission or other means of electronic
         communication that produces a written record and confirms receipt
         ("electronic transmission") addressed to the recipient as follows:

a.       to Wi-LAN:

         300, 801 Manning Road S.E.
         Calgary, Alberta T2E 8J5

         Attention:     Dr. Hatim Zaghloul (Strictly Confidential)
                        Fax:  (403) 273-5100

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                                        9

         with a copy to:

         Burnet, Duckworth & Palmer
         1400, 350 - 7th Avenue S.W.
         Calgary, Alberta T2P 3N9

         Attention:     Bill Maslechko (Strictly Confidential)
                        Fax: (403) 260-0337

b.       to the Sellers:

         3400 River Green Ct.
         Duluth, Georgia 30096

         Attention:     Lance Weller and Margaret Weller (Strictly Confidential)
                        Fax:     (770) 622-1223

         with a copy to:

         Schweber, Izenson, Anderson, LLP
         Suite 275, Lenox Plaza
         3384 Peachtree Rd. N.E.
         Atlanta, Georgia 30326

         Attention:     Mark Izenson (Strictly Confidential)
                        Fax:  (404) 812-5801

         or to such other address as may be designated by notice given by either
         party to the other. Any notice or other communication given by personal
         delivery shall be conclusively deemed to have been given the day of
         actual delivery and if given by electronic transmission on the day of
         sending if sent during normal business hours of the addressee on a
         business day and, If not, on the first business day thereafter.

13.      Each of the Sellers and Wi-LAN shall from time to time and at all times
         hereafter at the request of the other but without further
         consideration, do and perform all such further acts, matters and things
         and execute and deliver all such further documents, deeds, assignments,
         agreements, notices and writings and give such further assurances as
         shall be reasonably required for the purpose of vesting in Wi-LAN the
         Remaining Merger Consideration. Without limitation of the foregoing, if
         all or any part of the Remaining Merger Consideration shall not be
         assignable, or shall only be assignable with the consent or approval of
         any third party, the Sellers shall use their reasonable efforts to
         obtain such consent or approval and pending receipt thereof shall hold
         all rights or entitlements that the Sellers have thereto in trust for
         the exclusive benefit of Wi-LAN

14.      This agreement shall enure to the benefit of and be binding upon the
         parties hereto and their respective heirs, executors, administrators,
         successors and assigns.

15.      This agreement may be executed in as many counterparts as are necessary
         and, when a counterpart has been executed by each party, all
         counterparts together shall constitute one agreement. Delivery of
         counterparts may be effected by facsimile transmission.

16.      Each of the Sellers covenants and agrees with Wi-LAN that:

<PAGE>

                                       10

a.       The Sellers shall promptly and expeditiously deliver to Wi-LAN true
         copies of any and all notices, statements and other writings forwarded
         to the Sellers pertaining to the Remaining Merger Consideration.

b.       Neither of the Sellers shall in any manner whatsoever modify, after or
         amend the Merger Agreement in any manner which adversely affects
         Wi-LAN's receipt or enforcement of the Remaining Merger Consideration
         without first obtaining the prior written approval of Wi-LAN. The
         Sellers shall promptly inform Wi-LAN of any other proposed
         modifications, alterations or amendments to the Merger Agreement.

17.      This agreement and the obligations of the parties hereunder shall be
         interpreted in accordance with the laws of the Province of Alberta and
         the federal laws of Canada applicable therein.

18.      This agreement, together with the Other Documents, constitutes the
         entire agreement between the parties hereto, and cancels and supersedes
         all prior agreements and understandings between the parties hereto,
         with respect to the subject matter hereof, including, without
         limitation, the letter agreement among Wi-LAN and the Sellers dated
         June 2, 2000.

19.      The representations, warranties, covenants and agreements herein and in
         any Other Document delivered pursuant hereto shall survive the closing
         and remain in full force and effect provided that no party hereto shall
         be liable in respect of any representation or warranty unless the party
         seeking to rely upon such representation or warranty shall have given
         notice to the party who made such representation or warranty of its
         intention to make such claim on or before the date 24 months following
         the Closing Date.

20.      This agreement may only be amended by a written instrument signed by
         the parties hereto.

21.      No waiver by any party hereto shall be effective unless in writing and
         any waiver shall affect only the matter, and the occurrence thereof,
         specifically identified and shall not extend to any other matter or
         occurrence.

22.      If any one or more of the provisions or parts thereof contained in this
         agreement become invalid, illegal or unenforceable, in any respect in
         any jurisdiction, the remaining provisions or parts thereof contained
         herein shall be and shall be conclusively deemed to be, as to such
         jurisdiction, severable therefrom and:

a.       the validity, legality or enforceability of such remaining provisions
         or parts thereof shall not in any way be affected or impaired by the
         severance of the provisions or parts thereof severed; and

b.       the invalidity, illegality or unenforceability of any provision or part
         thereof contained in this agreement in any jurisdiction shall not
         affect or impair such provision or part thereof or any other provision
         of this agreement in any other jurisdiction.

23.      Provided that the Sellers are not in default under this agreement which
         adversely affects Wi-LAN's receipt or enforcement of the Remaining
         Merger Consideration, Wi-LAN shall issue the consideration payable to
         the Sellers pursuant to this agreement even if DTS defaults in its
         payment of the Remaining Merger Consideration to Wi-LAN, provided that
         the DTS default is not due to the Sellers default under or breach of
         the Merger Agreement or other action on the part of the Sellers or any
         one of them.

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                                       11

If the foregoing offer is acceptable to you, please indicate your acceptance in
the space provided below, whereupon this letter and your acceptance will
constitute a binding agreement between Wi-LAN and the Sellers.

Yours truly,

Wi-LAN INC.


/s/ Hatim Zaghloul
------------------------------------
Hatim Zaghloul
Chairman and Chief Executive Officer



AGREED AND ACCEPTED THIS 7TH DAY OF JUNE, 2000

/s/ Lance Weller
---------------------------------            ----------------------------------
Lance Weller                                 WITNESS as to the signature of
                                             Lance Weller



AGREED AND ACCEPTED THIS 7TH DAY OF JUNE, 2000

/s/ Margaret Weller
---------------------------------            ----------------------------------
Margaret Weller                              WITNESS as to the signature of
                                             Margaret Weller




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