EXHIBIT 10.15

Agreement dated December 19th, 2000 by and between NOCOPI TECHNOLOGIES, INC., a
corporation organized and existing under the laws of Maryland, with offices at
537 Apple Street, West Conshohocken, Pennsylvania 19428-2903 ("NOCOPI"), and
WESTVACO BRAND SECURITY INC., a corporation organized and existing under the
laws of Delaware, with offices at One High Ridge Park, Stamford, Connecticut
06905, and its AFFILIATES ("LICENSEE").

1. This Agreement amends a certain License Agreement (the "License Agreement")
   between the parties dated as of September 1, 2000.

   Section 1.13 is amended to state in its entirely as follows:

   Section 1.13 As used here there term "TERRITORY" shall mean the world with
   the exclusion of EUROPE as defined in the License Agreement.

   Section 4.03 is deleted in its entirely and all payments made to date under
   this section shall be returned to LICENSEE.

   Sections 7.01 and 7.02.1 are amended to set forth in their entirety are
   follows:

         7.01     This Agreement shall commence on September 1, 2000 and shall
                  continue until August 31, 2003 (unless terminated as
                  hereinafter provided); and thereafter from year to year,
                  unless and until terminated as provided for in Clause 7.02.1
                  hereof.

         7.02     LICENSEE and NOCOPI shall have the option of terminating this
                  Agreement in the following circumstances:

         7.02.1   After August 31, 2003, by one hundred and twenty (120) days'
                  notice, in advance and in writing, given by either Party to
                  the other.




2. If at any time during the term of the License Agreement, NOCOPI becomes able
   to grant LICENSEE the exclusive right to market, promote, sell and
   manufacture EXCLUSIVE PRODUCTS throughout the world, and the non-exclusive
   right to market, promote, sell and manufacture NON-EXCLUSIVE PRODUCTS,
   throughout the world, then TERRITORY shall be immediately redefined to
   include EUROPE, and NOCOPI will take all necessary actions to confirm such
   right.

   IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
executed by their respective representatives thereunto duly authorized as of the
date first hereinabove written.

                                       NOCOPI TECHNOLOGIES, INC.


                                       per:  /s/
                                             -----------------------------------
                                             Michael Feinstein, M.D.
                                             Chairman



                                       WESTVACO BRAND SECURITY INC.

                                       per: /s/
                                            ------------------------------------
                                            Stanley Gene Hart
                                            President