Document:

Exhibit 10.3
                                                                    ------------

                       NETWORK-1 SECURITY SOLUTIONS, INC.
                           445 PARK AVENUE, SUITE 1028
                              NEW YORK, N.Y. 10022

                                                              December 22, 2003
Corey M. Horowitz
c/o CMH Capital Management Corp.
445 Park Avenue, Suite 1028
New York, N.Y. 10022

Dear Corey:

     On behalf of Network-1 Security Solutions, Inc. ("Network-1"), this offer
letter will confirm our mutual understanding concerning your agreeing to become
Chief Executive Officer and Chairman of Network-1 as of the date hereof, subject
to the terms and provisions set forth herein. You will also continue to serve as
Chairman of Network-1's Board of Directors. The following is a summary of the
material terms of your employment.

1.   Title. Effective upon the date hereof, you will become Chief Executive
     Officer and Chairman of Network-1 and will receive the base salary set
     forth in paragraph 2 hereof. As a result of your assuming these positions
     on the date hereof, Network-1's consulting arrangement with CMH will cease
     to exist as of the date hereof.

2.   Compensation. Your base salary will be $210,000 (equal to the annual
     consulting fees previously paid to CMH Capital Management Corp. ("CMH")).

3.   Benefits. You shall be entitled to participate in group health, dental,
     life insurance benefits, and Network-1's retirement plan benefits made
     available to executive officers and other employees. You will be entitled
     to four (4) weeks vacation per year.

4.   Options. (a) Upon the execution of this offer letter, you are hereby
     granted five (5) year options to purchase an aggregate of 1.6 million
     shares of common stock of Network-1 (the "Options"), under the Company's
     Stock Option Plan, as follows: (i) an incentive stock option to purchase an
     aggregate of 1,084,782 shares of Common Stock, at an exercise price of $.23
     per share, of which 434,782 shares shall vest on the date hereof, 250,000
     shares shall vest on December 22, 2004, and 200,000 shares shall vest on
     each of December 22, 2005 and December 22, 2006 and (ii) a non-qualified
     stock option to purchase an aggregate of 515,218 shares of Common Stock, at
     an exercise price of $.13 per share, which shall vest in full on the date
     hereof.
<PAGE>

The form of incentive stock option and non-qualified stock option are attached
as Exhibits A and B hereto. After the issuance of the Options, the ownership
interest of you and CMH in Network-1 represented by currently owned stock
options (including the Options) and warrants as of the date hereof will be equal
to 15.6% on a fully diluted basis (assuming the exercise and conversion of all
outstanding options, warrants and convertible securities) (the "Derivative
Ownership Percentage"), as set forth on Exhibit C hereto.

          (b) At anytime during the period ended December 31, 2005, in the event
     that Network-1 completes a financing (either a single transaction or series
     of transactions) consisting of the issuance of common stock or any other
     securities convertible or exercisable into common stock, you shall receive
     from Network-1 such number of additional options to purchase Common Stock
     up to a maximum of 600,000 shares (subject to adjustment in the event of a
     stock split, reorganization, etc.) so that you maintain your Derivative
     Ownership Percentage.

5.   Employee-At-Will. This offer letter does not constitute an employment
     agreement and your relationship with Network-1 shall be one of an
     employee-at-will until such time (if at all) a mutually acceptable
     employment agreement is executed by you and Network-1.

6.   Confidentiality Agreement. You agree to execute Network-1's standard
     confidentiality agreement that is required to be executed by all of our
     employees.

            If this letter correctly confirms our understanding, kindly execute
below.

                                      Sincerely,

                                      s/Edward James
                                      -----------------------------------------
                                      Edward James
                                      Interim Chief Executive Officer and Chief
                                      Financial Officer
                                      Network-1 Security Solutions, Inc.

      Agreed and Accepted:

      s/Corey M. Horowitz
      -----------------------------
      Corey M. Horowitz
<PAGE>

                                    EXHIBIT A

                       NETWORK-1 SECURITY SOLUTIONS, INC.

                             INCENTIVE STOCK OPTION

                                            Date of Grant:  December 22, 2003

To:  Corey M. Horowitz
     1085 Park Avenue
     New York, New York  10128

     You are hereby granted an option (the "Option"), effective as of the date
hereof, to purchase 1,084,782 shares of Common Stock, par value $.01 per share
("Common Stock"), of Network-1 Security Solutions, Inc. (the "Company") at an
exercise price of $.23 per share (the "Exercise Price") pursuant to the
Company's Stock Option Plan, as amended (the "Plan"). Your Exercise Price is
intended to equal at least the fair market value of the Company's Common Stock
as of the date hereof; provided, however, that if, at the time this Option is
granted, you own stock possessing more than 10% of the total combined voting
power of all shares of stock of the Company or any parent or subsidiary (an
"Affiliate") of the Company (a "10% Shareholder"), your Exercise Price is
intended to be at least 110% of the fair market value of the Company's Common
Stock as of the date hereof.

     Your Option shall vest over a three (3) year period as follows: (i) 434,782
shares on the date hereof; (ii) 250,000 shares on the one year anniversary from
the date hereof; (iii) 200,000 shares on the two year anniversary from the date
hereof; and (iv) 200,000 shares on the three year anniversary from the date
hereof.

     In the event of (i) a "change of control" (as hereinafter defined) of the
Company occurs at any time prior to the Expiration Date (as hereinafter
defined), your Option may, from and after such date, and notwithstanding the
second paragraph of this Option, be exercised for up to 100% of the total number
of shares then subject to the Option minus the number of shares previously
purchased upon exercise of the Option (as adjusted for any changes in the
outstanding Common Stock by reason of a stock dividend, stock split, combination
of shares, recapitalization, merger, consolidation, transfer of assets,
reorganization, conversion or what the Compensation Committee deems in its sole
discretion to be similar circumstances).
<PAGE>

     A "Change of Control" shall be deemed to have occurred upon the happening
of any of the following events:(i) the shareholders of the Company approve a
merger or consolidation of the Company with any other entity, other than a
merger or consolidation which would result in the voting securities of the
Company outstanding immediately prior thereto continuing to represent more than
fifty percent (50%) of the total voting power represented by the voting
securities of the Company or such surviving entity outstanding immediately after
such merger or consolidation, or the shareholders of the Company approve a plan
of complete liquidation of the Company or consummate the sale or disposition by
the Company of all or substantially all of the Company's assets (other than to a
subsidiary or subsidiaries) or (ii) any other event deemed to constitute a
"Change of Control" by the Board of Directors of the Company.

     In lieu of paying the Exercise Price in cash and/or upon exercise of the
Option, you may elect a "cashless exercise" in which event you will receive upon
exercise a reduced number of shares equal to (i) the number of shares that would
be issuable pursuant to this Option upon payment of the Exercise Price minus
(ii) the number of shares that have an aggregate Market Price (as defined below)
equal to the Exercise Price.

     The shares subject to this Option shall be adjusted for any change in the
outstanding shares of the Common Stock of the Company by reason of a stock
dividend, stock split, combination of shares, recapitalization, merger,
consolidation, transfer of assets, reorganization, conversion or what the
Compensation Committee deems in its sole discretion to be similar circumstances.
No fractional shares shall be issued or delivered.

     This Option shall terminate and is not exercisable after the expiration of
five years from the date of its grant (five years from the date of grant rather
than ten years from the time of the grant, because you are a 10% Shareholder),
except if terminated earlier as hereinafter provided (the "Expiration Date").

     You may exercise your option as set forth in Section 7 of the Plan.

     If the Company's Common Stock has not been registered under Section 12 of
the Securities Exchange Act of 1934, the exercise of your Option will not be
effective unless and until you execute and deliver to the Company a Stock
Restriction Agreement, in the form on file in the office of the Secretary of the
Company.

     Your Option will, to the extent not previously exercised by you, terminate
one (1) year after the date on which your employment by the Company or Affiliate
of the Company is terminated, whether such termination is voluntary or not,
whether by reason of disability as defined in Section 22(e)(3) of the Internal
Revenue Code of 1986, as amended (the "Code"), and the regulations thereunder,
or death. After the date your employment is terminated, as aforesaid, you may
exercise this Option only for the number of shares which you had a right to
purchase and did not purchase on the date your employment terminated. If you are
employed by an Affiliate of the Company, your employment shall be deemed to have
terminated on the date your employer ceases to be an Affiliate of the Company,
unless you are on that date transferred to the Company or

                                       2
<PAGE>

another Affiliate of the Company. Your employment shall not be deemed to have
terminated if you are transferred from the Company to an Affiliate, or vice
versa, or from one Affiliate to another Affiliate.

     If you die while employed by the Company or an Affiliate of the Company,
your legatee(s), distributee(s), executor(s) or administrator(s), as the case
may be, may, at any time within one (1) year after the date of your death,
exercise the Option as to any shares which you had a right to purchase and did
not purchase during your lifetime. If your employment with the Company, or an
Affiliate is terminated by reason of your becoming disabled (within the meaning
of Section 22(e)(3) of the Code and the regulations thereunder), you or your
legal guardian or custodian may at any time within one (1) year after the date
of such termination, exercise the Option as to any shares which you had a right
to purchase and did not purchase prior to such termination. Your legatee,
distributee, executor, administrator, guardian or custodian must present proof
of his authority satisfactory to the Company prior to being allowed to exercise
this Option.

     This Option is not transferable otherwise than by will or the laws of
descent and distribution, and is exercisable during your lifetime only by you,
including, for this purpose, your legal guardian or custodian in the event of
disability. Until the Option Price has been paid in full pursuant to due
exercise of this Option and the purchased shares are delivered to you, you do
not have any rights as a shareholder of the Company. The Company reserves the
right not to deliver to you the shares purchased by virtue of the exercise of
this Option during any period of time in which the Company deems, in its sole
discretion, that such delivery would violate a federal, state, local or
securities exchange rule, regulation or law.

     The following two paragraphs shall be applicable if, on the date of
exercise of this Option, the Common Stock to be purchased pursuant to such
exercise has not been registered under the Securities Act of 1933, as amended,
and under applicable state securities laws, and shall continue to be applicable
for so long as such registration has not occurred:

     (a) You hereby agree, warrant and represent that you will acquire the
Common Stock to be issued hereunder for your own account for investment purposes
only, and not with a view to, or in connection with, any resale or other
distribution of any of such shares, except as hereafter permitted. You further
agree that you will not at any time make any offer, sale, transfer, pledge or
other disposition of such Common Stock to be issued hereunder without an
effective registration statement under the Securities Act of 1933, as amended,
and under any applicable state securities laws or an opinion of counsel
acceptable to the Company to the effect that the proposed transaction will be
exempt from such registration. You shall execute such instruments,
representations, acknowledgements and agreements as the Company may, in its sole
discretion, deem advisable to avoid any violation of federal, state, local or
securities exchange rule, regulation or law; (b) The certificates for Common
Stock to be issued to you hereunder shall bear the following legend:

                                       3
<PAGE>

          "The shares represented by this certificate have not been registered
     under the Securities Act of 1933, as amended, or under applicable state
     securities laws. The shares have been acquired for investment and may not
     be offered, sold, transferred, pledged or otherwise disposed of without an
     effective registration statement under the Securities Act of 1933, as
     amended, and under any applicable state securities laws or an opinion of
     counsel acceptable to the Company that the proposed transaction will be
     exempt from such registration."

     The foregoing legend shall be removed upon registration of the legended
shares under the Securities Act of 1933, as amended, and under any applicable
state laws or upon receipt of any opinion of counsel acceptable to the Company
that said registration is no longer required.

     The sole purpose of the agreements, warranties, representations and legend
set forth in the two immediately preceding paragraphs is to prevent violations
of the Securities Act of 1933, as amended, and any applicable state securities
laws.

     It is the intention of the Company and you that this option shall, if
possible, be an "Incentive Stock Option" as that term is used in Section 422 of
the Code and the regulations thereunder. In the event this Option is in any way
inconsistent with the legal requirements of the Code or the regulations
thereunder for an "Incentive Stock Option" this Option shall be deemed
automatically amended as of the date hereof to conform to such legal
requirements, if such conformity may be achieved by amendment.

     This Option shall be subject to the terms of the Plan in effect on the date
this Option is granted, which terms are hereby incorporated herein by reference
and made a part hereof. In the event of any conflict between the terms of this
Option and the terms of the Plan in effect on the date of this Option, the terms
of the Plan shall govern. This Option constitutes the entire understanding
between the Company and you with respect to the subject matter hereof and no
amendment, modification or waiver of this Option, in whole or in part, shall be
binding upon the Company unless in writing and signed by an appropriate officer
of the Company. This Option and the performances of the parties hereunder shall
be construed in accordance with and governed by the laws of the State of New
York without regard to principles of conflict of law.

     Please sign the copy of this Option and return it to the Company, thereby
indicating your understanding of and agreement with its terms and conditions.

                                      NETWORK-1 SECURITY SOLUTIONS, INC.

                                      By:
                                         ---------------------------------------
                                         Edward James
                                         Chief Financial Officer

                                        4
<PAGE>

     I hereby acknowledge receipt of a copy of the foregoing Stock Option for
1,084,782 shares at an Exercise Price of $.23 per share and the Network-1
Security Solutions, Inc. Stock Option Plan, and having read such documents,
hereby signify my understanding of, and my agreement with, their terms and
conditions.

--------------------------------                    ----------------------------
Corey M. Horowitz                                    (Date)  December 22, 2003

                                        5
<PAGE>

                                    EXHIBIT B
                                    ---------

                           NON-QUALIFIED STOCK OPTION

To:  Corey M. Horowitz
        1085 Park Avenue
        New York, New York  10128

Date of Grant:  December 22, 2003

     You are hereby granted an option (the "Option"), effective as of the date
hereof, to purchase 515,218 shares of Common Stock, par value $.01 per share
("Common Stock"), of Network-1 Security Solutions, Inc. (the "Company") at an
exercise price of $.13 per share (the "Option Price") pursuant to the Company's
1996 Option Plan, as amended (the "Plan"). Your Option shall terminate and is
not exercisable after the expiration of five (5) years from the date of its
grant (the "Expiration Date"). Your Option shall vest in its entirety on the
date hereof.

     The shares subject to this Option shall be adjusted for any change in the
outstanding shares of the Common Stock of the Company by reason of a stock
dividend, stock split, combination of shares, recapitalization, merger,
consolidation, transfer of assets, reorganization, conversion or what the
Compensation Committee deems in its sole discretion to be similar circumstances.
No fractional shares shall be issued or delivered.

     In lieu of paying the Option Price in cash and/or upon exercise of the
Option, you may elect a "cashless exercise" in which event you will receive upon
exercise a reduced number of shares equal to (i) the number of shares that would
be issuable pursuant to this Option upon payment of the Option Price minus (ii)
the number of shares that have an aggregate Market Price (as defined below)
equal to the Option price.

     You may exercise your Option as set forth in Section 7 of the Plan.

     If the Company's Common Stock has not been registered under Section 12 of
the Securities Exchange Act of 1934, the exercise of your Option will not be
effective unless and until you execute and deliver to the Company a Stock
Restriction Agreement, in the form on file in the office of the Secretary of the
Company.

     This Option is not transferable (except to a Permitted Transferee as
provided in the Plan) otherwise than by will or the laws of descent and
distribution. Until the Option price has been paid in full pursuant to due
exercise of this Option and the purchased shares are delivered to you, you do
not have any rights as a shareholder of the Company. The Company reserves the
right not to deliver to you the shares purchased by virtue of the exercise of
this Option during any period of time in which the Company deems, in its sole
discretion, that such delivery would violate a federal state, local or
securities exchange rule, regulation or law.
<PAGE>

     For purposes of any computations made hereunder, "Market Price" per share
of Common Stock on any date shall be: (i) if the Common Stock is listed or
admitted for trading on any national securities exchange, the last reported
sales price as reported on such national securities exchange; (ii) if the Common
Stock is not listed or admitted for trading on any national securities exchange,
the last reported closing price for the Common Stock as reported on the Nasdaq
Stock Market's National Market ("NNM") or Nasdaq Stock Market's Small Cap Market
("NSM") or a similar service if NNM or NSM are not reporting such information;
(iii) if the Common Stock is not listed or admitted for trading on any national
securities exchange, NNM or NSM or a similar service, the average of the last
reported bid and asked quotation for the Common Stock as quoted by a market
maker in the Common Stock (or if there is more than one market maker, the bid
and asked quotation shall be obtained from two market makers and the average of
the lowest bid and highest asked quotation shall be the "Market Price"); or (iv)
if the Common Stock is not listed or admitted for trading on any national
securities exchange or NNM or quoted by NSM and there is no market maker in the
Common Stock, the fair market value of such shares as determined in good faith
by the Board of Directors of the Company.

     This Option shall be subject to the terms of the Plan in effect on
the date this Option is granted, which terms are hereby incorporated herein by
reference and made a part hereof. In the event of any conflict between the terms
of this Option and the terms of the Plan in effect on the date of this Option,
the terms of the Plan shall govern. This Option constitutes the entire
understanding between the Company and you with respect to the subject matter
hereof and no amendment, modification or waiver of this Option, in whole or in
part, shall be binding upon the Company unless in writing and signed by an
appropriate officer of the Company. This Option and the performances of the
parties hereunder shall be construed in accordance with and governed by the laws
of the State of New York without regard to principles of conflict of law.

     Please sign the copy of this Option and return it to the Company, thereby
indicating your understanding of and agreement with its terms and conditions.

                                      NETWORK-1 SECURITY SOLUTIONS, INC.

                                      By:
                                         ---------------------------------------
                                         Edward James
                                         Chief Financial Officer

     The undersigned hereby acknowledges receipt of a copy of the foregoing
Stock Option and the Network-1 Security Solutions, Inc. 1996 Stock Option Plan,
as amended, and having read such documents, hereby signify my understanding of,
and my agreement with, their terms and conditions.

--------------------------------                    ----------------------------
Corey M. Horowitz                                    (Date)  December 22, 2003

                                       2
<PAGE>

                                    EXHIBIT C
                                    ---------

                           Capitalization of Network-1

Common Stock                                                           8,314,458

Preferred D Stock (as converted)                                         391,478

Preferred E Stock (as converted)                                       4,967,016

Warrants (issued in Preferred E financing)                               500,000

Warrants (issued in Preferred D financing)                             1,352,048

Other Warrants                                                           992,582

Options under Stock Option Plan (including New 1,600,000
CMH options)                                                           3,252,370

Total Fully Diluted                                                   19,769,952

CMH/Corey Horowitz Options/Warrants                                    3,132,241

Derivative Percentage                                                      15.8%EXHIBIT 10.4
                                                                    ------------

                       NETWORK-1 SECURITY SOLUTIONS, INC.
                           445 PARK AVENUE, SUITE 1028
                              NEW YORK, N.Y. 10022

                                                                January 22, 2004

Mr. David Kahn
380 Hempstead Ave, Suite 5
West Hempstead, NY 11552

Dear David;

     On behalf of Network-1 Security Solutions, Inc. (the "Company"), this
letter summarizes the terms upon which Network-1 will retain the services of
David C. Kahn, CPA to serve as Chief Financial Officer of the Company.

     The Company has agreed to use your services for the year ending December
31, 2004. In consideration thereof, you shall be paid as follows:

     (i)   $5500 per month for the period from the date of this letter through
           April 30, 2004;

     (ii)  $4500 per month from May 1, 2005 through August 31, 2004; and

     (iii) $3500 per month from September 1, 2004 through December 31, 2004.

     Subject to the approval of the Company's Board of Directors, you will also
receive options (the "Option") to purchase 50,000 shares of common stock of
Network-1, under the Company's Stock Option Plan, at an exercise price equal to
the fair market value of the shares on the date of approval by the Company's
Board of Directors. 20,000 shares underlying the Option shall vest immediately
and the balance shall vest on a monthly basis through December 31, 2004.

     As Chief Financial Officer of the Company you will be responsible, among
other things, for the maintenance of the books and records of the Company, the
preparation of tax returns and financial statements for the Board of Directors
of the Company and for required financial filings with the Securities and
Exchange Commission including certifications required to be signed by you as
Chief Financial Officer. You will be also be required to sign the Company's
standard work for hire non-competition, nondisclosure, and confidentiality
agreement.
<PAGE>
     You understand that your relationship with the Company will be as an
independent contractor and not as an employee. The Company may terminate this
letter agreement and your services at anytime for any reason. However, in the
event your employment is terminated without "Good Cause" (as defined below), you
shall be entitled to receive the balance of the payments owed to you through
December 31, 2004 and the accelerated vesting of all remaining unvested Options.
A termination for "Good Cause" shall be defined as follows: (i) commission of an
act constituting a felony or involving fraud, moral turpitude, theft or
dishonesty which is not a felony and which materially adversely affects the
Company or could reasonably be expected to materially adversely affect the
Company, (ii) failure to perform your duties as Chief Financial Officer which,
if curable, shall not have been cured with 10 days written notice from the
Company, (iii) failure to follow the lawful directions of the Board of Directors
of the Company, which, if curable, shall not have been cured within 10 days
written notice from the Company, or (iv) a material breach of the terms of this
letter agreement.

     This letter agreement shall be governed by the laws of the State of New
York without regard to principles of conflict of laws.

     It is a great pleasure to welcome you to Network-1 Security Solutions, Inc.
I fully expect that you will make a major contribution to the Company's success.

                                                           Sincerely,

                                                           /s/ Corey M. Horowitz
                                                           ---------------------
                                                           Corey M. Horowitz,
                                                           Chairman and CEO

I accept the offer to join Network-1 Security Solutions, Inc. and confirm the
understanding of the above terms and conditions.

/s/ David C. Kahn, CPA
-------------------------
David C. Kahn, CPA

Date: January 22, 2004

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