<TABLE> <S> <C>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED FINANCIAL STATEMENTS OF NETWORK-1 SECURITY SOLUTIONS, INC. FOR THE
PERIOD ENDED SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 5,896,000
<SECURITIES> 0
<RECEIVABLES> 413,000
<ALLOWANCES> 59,000
<INVENTORY> 18,000
<CURRENT-ASSETS> 6,401,000
<PP&E> 612,000
<DEPRECIATION> 177,000
<TOTAL-ASSETS> 7,579,000
<CURRENT-LIABILITIES> 1,130,000
<BONDS> 0
0
2,000
<COMMON> 64,000
<OTHER-SE> 5,540,000
<TOTAL-LIABILITY-AND-EQUITY> 7,579,000
<SALES> 775,000
<TOTAL-REVENUES> 890,000
<CGS> 52,000
<TOTAL-COSTS> 345,000
<OTHER-EXPENSES> 4,222,000
<LOSS-PROVISION> 25,000
<INTEREST-EXPENSE> 1,567,000
<INCOME-PRETAX> (5,026,000)
<INCOME-TAX> 0
<INCOME-CONTINUING> (5,026,000)
<DISCONTINUED> 2,154,000
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (2,872,000)
<EPS-BASIC> (0.49)
<EPS-DILUTED> (0.49)
</TABLE>