Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1 under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Common Stock, $0.01 par value per share, of Network-1 Security Solutions, Inc. and that this Agreement be included as an Exhibit to such joint filing. IN WITNESS WHEREOF, the undersigned hereby execute this Agreement effective as of the 2nd day of October, 2001. WHEATLEY PARTNERS II, L.P. By: /s/ Irwin Lieber ---------------------------------------- Irwin Lieber, General Partner APPLEWOOD CAPITAL CORP. By: /s/ Barry Rubenstein ---------------------------------------- Barry Rubenstein, President SENECA VENTURES By: /s/ Barry Rubenstein ---------------------------------------- Barry Rubenstein, General Partner WOODLAND VENTURE FUND By: /s/ Barry Rubenstein ---------------------------------------- Barry Rubenstein, General Partner WOODLAND SERVICES CORP. By: /s/ Barry Rubenstein ---------------------------------------- Barry Rubenstein, President /s/ Barry Rubenstein -------------------------------------------- Barry Rubenstein /s/ Irwin Lieber -------------------------------------------- Irwin Lieber Page 32 of 33 /s/ Barry Fingerhut --------------------------------------------------- Barry Fingerhut /s/ Marilyn Rubenstein --------------------------------------------------- Marilyn Rubenstein /s/ Seth Lieber --------------------------------------------------- Seth Lieber /s/ Jonathan Liber --------------------------------------------------- Jonathan Lieber WOODLAND PARTNERS By: /s/ Barry Rubenstein ----------------------------------------------- Barry Rubenstein, General Partner BROOKWOOD PARTNERS, L.P. By: /s/ Barry Rubenstein ----------------------------------------------- Barry Rubenstein, General Partner APPLEGREEN PARTNERS By: /s/ Jonathan Lieber ----------------------------------------------- Jonathan Lieber, General Partner WHEATLEY PARTNERS, L.P. By: Wheatley Partners, LLC, General Partner By: /s/ Barry Rubenstein ----------------------------------------------- Barry Rubenstein, CEO WHEATLEY FOREIGN PARTNERS, L.P. By: Wheatley Partners, LLC, General Partner By: /s/ Barry Rubenstein ----------------------------------------------- Barry Rubenstein, CEO WHEATLEY PARTNERS, LLC By: /s/ Barry Rubenstein ----------------------------------------------- Barry Rubenstein, CEO Page 33 of 33