EXHIBIT 99.1
                                                                    ------------

FOR IMMEDIATE RELEASE
COREY M. HOROWITZ, CHAIRMAN AND CEO
NETWORK-1 SECURITY SOLUTIONS, INC.
212-829-5770


                    NETWORK-1 EXTENDS WARRANT EXPIRATION DATE

NEW YORK, December 14, 2005--Network-1 Security Solutions, Inc. (OTC: NSSI.OB)
today announced that it has extended for three months the expiration date of
certain warrants to purchase 1,352,152 shares of Common Stock, which were
originally issued in 1999 in connection with a private financing and which were
scheduled to expire on December 22, 2005. The warrants now will expire on March
22, 2006 and are exercisable for one share of Common Stock of Network-1 at
exercise prices ranging from $1.00 to $1.11 per share.

ABOUT NETWORK-1 SECURITY SOLUTIONS, INC.

Network-1 Security Solutions, Inc. is engaged in the acquisition, development,
licensing and protection of its intellectual property and proprietary
technologies. As part of its business strategy it is offering licenses to third
parties who Network-1 believes could benefit from the technologies covered by
its patents. In February 2004, the Company initiated its licensing efforts
relating to its patent (U.S. Patent No. 6,218,930) covering the remote delivery
of power over Ethernet cables.

THIS RELEASE CONTAINS FORWARD-LOOKING STATEMENTS WITHIN THE MEANING OF THE "SAFE
HARBOR" PROVISIONS OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995.
THESE STATEMENTS ADDRESS FUTURE EVENTS AND CONDITIONS CONCERNING THE COMPANY'S
BUSINESS PLANS. SUCH STATEMENTS ARE SUBJECT TO A NUMBER OF RISK FACTORS AND
UNCERTAINTIES AS DISCLOSED IN THE COMPANY'S QUARTERLY REPORT ON FORM 10-QSB FOR
THE THREE MONTHS ENDED SEPTEMBER 30, 2005 INCLUDING, AMONG OTHERS, THE ABILITY
OF NETWORK-1 TO OBTAIN LICENSE AGREEMENTS FROM THIRD PARTIES FOR ITS PATENT
PORTFOLIO, UNCERTAINTY OF PATENT LITIGATION, THE COMPANY'S ABILITY TO ACHIEVE
REVENUES AND PROFITS FROM ITS PATENT PORTFOLIO, THE COMPANY'S ABILITY TO RAISE
CAPITAL WHEN NEEDED, FUTURE ECONOMIC CONDITIONS AND TECHNOLOGY CHANGES AND
LEGISLATIVE, REGULATORY AND COMPETITIVE DEVELOPMENTS. EXCEPT AS OTHERWISE
REQUIRED TO BE DISCLOSED IN PERIODIC REPORTS, THE COMPANY EXPRESSLY DISCLAIMS
ANY FUTURE OBLIGATION OR UNDERTAKING TO UPDATE OR REVISE ANY FORWARD-LOOKING
STATEMENT CONTAINED HEREIN.