5 THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE UNAUDITED FINANCIAL STATEMENTS OF NETWORK-1 SECURITY SOLUTIONS, INC. FOR THE PERIOD ENDED JUNE 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. 6-MOS DEC-31-2000 JAN-01-2000 JUN-30-2000 6,339,000 0 384,000 60,000 21,000 6,832,000 593,000 144,000 8,028,000 866,000 0 0 2,000 62,000 6,271,000 8,028,000 474,000 544,000 29,000 219,000 2,743,000 25,000 1,551,000 (3,845,000) 0 (3,845,000) 2,087,000 0 0 (1,758,000) (0.31) (0.31)