FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
HOROWITZ COREY M
   2. Issuer Name and Ticker or Trading Symbol
NETWORK 1 SECURITY SOLUTIONS INC [NSSI-OTC] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director __X__ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
CEO and Chairman
(Last)
(First)
(Middle)
C/O CMH CAPITAL MANAGEMENT CORP, 445 PARK AVENUE, SUITE 1018		 3. Date of Earliest Transaction (Month/Day/Year)
12/10/2010
(Street)

NEW YORK, NY 10022		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, $.01 par value per share 12/10/2010   M   1,084,782 A $ 0.23 1,353,585 D (1)  
Common Stock, $.01 par value per share               2,042,800 I See Footnote (2)
Common Stock, $.01 par value per share 12/14/2010   S   1,000 D $ 1.62 1,352,575 D (3)  
Common Stock, $.01 par value per share 12/14/2010   S   51,000 D $ 1.58 1,301,585 D (3)  
Common Stock, $.01 par value per share 12/14/2010   S   28,500 D $ 1.56 1,273,085 D (3)  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Option to purchase common stock $ 0.23 12/10/2010   M   1,084,782   12/22/2003 12/22/2011 Common Stock 1,084,782 $ 0 5,871,413 D (1)  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
HOROWITZ COREY M
C/O CMH CAPITAL MANAGEMENT CORP
445 PARK AVENUE, SUITE 1018
NEW YORK, NY 10022		   X   X   CEO and Chairman  
CMH CAPITAL MANAGEMENT CORP
445 PARK AVENUE
SUITE 1018
NEW YORK, NY 10022		     X    

Signatures

 By: /s/ Corey M. Horowitz   12/13/2010
**Signature of Reporting Person Date
 By: /s/ Corey M. Horowitz for CMH Capital Management Corp.   12/13/2010
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents the exercise by Corey M. Horowitz of incentive stock options issued under the Issuer's 1996 Stock Option Plan, as amended.
(2) The shares are owned directly by CMH Capital Management Corp. and indirectly by Corey M. Horowitz. CMH Capital Management Corp. is an entity in which Corey Horowitz is the sole officer, director and shareholder.
(3) Represents the sale of a portion of the shares underlying the option exercised by Corey M. Horowitz on December 10, 2010.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.