5

THIS SCHEDULE CONTAINS FINANCIAL INFORMATION EXTRACTED FROM THE UNAUDITED FINANCIAL STATEMENTS OF NETWORK-1 SECURITY SOLUTIONS, INC. FOR THE PERIOD ENDED JUNE 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.

6-MOS DEC-31-1998 JAN-01-1998 JUN-30-1998 634,000 0 697,000 88,000 15,000 1,278,000 769,000 446,000 3,129,000 3,707,000 0 0 5,000 17,000 (600,000) 3,129,000 412,000 902,000 395,000 667,000 1,769,000 18,000 438,000 (1,990,000) 0 (1,990,000) 0 0 0 (1,990,000) (1.17) (1.17)