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


FOR IMMEDIATE RELEASE

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


                NETWORK-1 AND POWERDSINE SETTLE PATENT LITIGATION


     NEW YORK, NOVEMBER 17, 2005-- Network-1 Security Solutions, Inc. (OTCBB:
NSSI.OB) today announced that it has entered into a Settlement Agreement with
PowerDsine, Inc. (NASDAQ: PDSN) and PowerDsine Ltd. which dismisses, with
prejudice, a civil action brought by PowerDsine in the United States District
Court for the Southern District of New York that sought a declaratory judgment
that U.S. Patent No. 6,218,930 (the "Remote Power Patent") owned by Network-1
was invalid and not infringed by PowerDsine and/or its customers.

     Under the terms of the Settlement Agreement, Network-1 has agreed that it
will not initiate litigation against PowerDsine for its sale of Power over
Ethernet (PoE) integrated circuits In addition, Network-1 has agreed that it
will not seek damages for infringement from customers that incorporate
PowerDsine integrated circuit products in PoE capable Ethernet switches
manufactured on or before April 30, 2006. PowerDsine has agreed that it will not
initiate, assist or cooperate in any action or litigation against Network-1
relating to the validity or infringement, if any, by PowerDsine or its customers
of the Remote Power Patent. The Remote Power Patent was granted on April 11,
2001 and expires on March 11, 2020.

     Network-1 also agreed that it will not initiate litigation against
PowerDsine or its customers for infringement of the Remote Power Patent arising
from the manufacture and sale of PowerDsine Midspan products for three years
following the dismissal date. Following such three year period, Network-1 may
seek damages for infringement of the Remote Power Patent from PowerDsine or its
customers with respect to the purchase and sale of Midspan products beginning 90
days following the dismissal date.

     No licenses to use the technologies covered by the Remote Power Patent were
granted to PowerDsine or its customers under the terms of the settlement.
Network-1 is currently offering licenses to the Remote Power Patent to all
vendors of Power over Ethernet equipment. For the full terms of the settlement
with PowerDsine, see the text of the Settlement Agreement which has been filed
as an exhibit to Network-1's Current Report on Form 8-K which was filed today
with the SEC.

     "This Settlement with PowerDsine, the technology market leader and major
contributor to the development of the Power over Ethernet Standard, is welcomed
by Network-1 in that it eliminates the distraction created by this litigation
and advances



Network-1 intentions to license the Remote Power Patent to
manufacturers and suppliers of finished PoE system products and not suppliers of
semiconductor components used in such systems." commented Corey M. Horowitz,
Chairman and Chief Executive Officer of Network-1.

     The Company's Remote Power Patent relates to, among other things, several
key technologies underlying the IEEE 802.3af Power Over Ethernet (PoE) standard
that was approved on June 13, 2003 by the Institute of Electrical and Electronic
Engineers (IEEE) (the Standard). The Standard governs the delivery of Power over
Ethernet cables in order to power network connected devices including, among
others, VoIP phones, wireless LAN access points and IP network cameras.

     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.