RSA LABORATORIES
                      PROGRAM LICENSE AGREEMENT
                           January 5, 1993

RSA LABORATORIES, A DIVISION OF RSA DATA SECURITY, INC. ("RSA")
GRANTS YOU A LICENSE AS FOLLOWS TO THE "RSAREF" PROGRAM:

1.   LICENSE. RSA grants you a non-exclusive, non-transferable,
     perpetual (subject to the conditions of section 8) license
     for the "RSAREF" program (the "Program") and its associated
     documentation, subject to all of the following terms and
     conditions:

     a.   to use the Program on any computer in your possession;

     b.   to make copies of the Program for back-up purposes;

     c.   to modify the Program in any manner for porting or
          performance improvement purposes (subject to Section 2)
          or to incorporate the  Program into other computer programs 
          for your own personal or internal use, provided that you 
          provide RSA with a copy  of any such modification or 
          Application Program by electronic mail, and grant RSA 
          a perpetual, royalty-free license to use and distribute 
          such modifications and Application Programs on the terms 
          set forth in this Agreement.

     d.   to copy and distribute the Program and Application Programs
          in accordance with the limitations set forth in Section 2.

"Application Programs" are programs which incorporate all or any
portion of the Program in any form. The restrictions imposed on
Application Programs in this Agreement shall not apply to any software
which, through the mere aggregation on distribution media, is
co-located or stored with the Program.

2.   LIMITATIONS ON LICENSE.

     a.   RSA owns the Program and its associated documentation and
          all copyrights therein. You may only use, copy, modify and
          distribute the Program as expressly provided for in this
          Agreement. You must reproduce and include this Agreement,
          RSA's copyright notices and disclaimer of warranty on any
          copy and its associated documentation.

     b.   The Program and all Application Programs are to be used only
          for non-commercial purposes. However, media costs associated
          with the distribution of the Program or Application Programs
          may be recovered.

     c.   The Program, if modified, must carry prominent notices
          stating that changes have been made, and the dates of any
          such changes. 

     d.   Prior permission from RSA is required for
          any modifications that access the Program through ways
          other than the published Program interface or for 
          modifications to the Program interface. RSA will grant
          all reasonable requests for permission to make such
          modifications.

3.   NO RSA OBLIGATION. You are solely responsible for all of your
     costs and expenses incurred in connection with the distribution
     of the Program or any Application Program hereunder, and RSA
     shall have no liability, obligation or responsibility therefor.
     RSA shall have no obligation to provide maintenance, support,
     upgrades or new releases to you or to any distributee of the
     Program or any Application Program.

4.   NO WARRANTY OF PERFORMANCE. THE PROGRAM AND ITS ASSOCIATED
     DOCUMENTATION ARE LICENSED "AS IS" WITHOUT WARRANTY AS TO THEIR
     PERFORMANCE, MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR
     PURPOSE. THE ENTIRE RISK AS TO THE RESULTS AND PERFORMANCE OF
     THE PROGRAM IS ASSUMED BY YOU AND YOUR DISTRIBUTEES. SHOULD THE
     PROGRAM PROVE DEFECTIVE, YOU AND YOUR DISTRIBUTEES (AND NOT RSA)
     ASSUME THE ENTIRE COST OF ALL NECESSARY SERVICING, REPAIR OR
     CORRECTION.

5.   LIMITATION OF LIABILITY. EXCEPT AS EXPRESSLY PROVIDED FOR IN
     SECTION 6 HEREINUNDER, NEITHER RSA NOR ANY OTHER PERSON WHO HAS
     BEEN INVOLVED IN THE CREATION, PRODUCTION, OR DELIVERY OF THE
     PROGRAM SHALL BE LIABLE TO YOU OR TO ANY OTHER PERSON FOR ANY
     DIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF RSA HAS BEEN
     ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

6.   PATENT INFRINGEMENT OBLIGATION. Subject to the limitations set
     forth below, RSA, at its own expense, shall: (i) defend, or at
     its option settle, any claim, suit or proceeding against you on
     the basis of infringement of any United States patent in the
     field of cryptography by the unmodified Program; and (ii) pay
     any final judgment or settlement entered against you on such
     issue in any such suit or proceeding defended by RSA. The
     obligations of RSA under this Section 6 are subject to: 
     (i) RSA's having sole control of the defense of any such claim, 
     suit or proceeding; (ii) your notifying RSA promptly in writing
     of each such claim, suit or  proceeding and giving RSA authority
     to proceed as stated in this  Section 6; and (iii) your giving 
     RSA all information known to you relating to such claim, 
     suit or proceeding and cooperating  with RSA to defend any such 
     claim, suit or proceeding. RSA shall have no obligation under 
     this Section 6 with respect to any claim to the extent it is 
     based upon (A) use of the Program  as modified by any person 
     other than RSA or use of any Application Program, where use 
     of the unmodified Program would not constitute an infringement, 
     or (B) use of the Program in a manner other than that permitted 
     by this Agreement.  THIS SECTION 6 SETS FORTH RSA'S ENTIRE 
     OBLIGATION AND YOUR EXCLUSIVE REMEDIES CONCERNING CLAIMS FOR  
     PROPRIETARY RIGHTS INFRINGEMENT.

     NOTE: Portions of the Program practice methods described in and
     subject to U.S. Patents Nos. 4,200,770, 4,218,582 and 4,405,829,
     and all foreign counterparts and equivalents, issued to Leland
     Stanford Jr. University and to Massachusetts Institute of
     Technology. Such patents are licensed to RSA by Public Key
     Partners of Sunnyvale, California, the holder of exclusive
     licensing rights. This Agreement does not grant or convey any
     interest whatsoever in such patents.

7.   RSAREF is a non-commercial publication of cryptographic
     techniques. Portions of RSAREF have been published in the
     International Security Handbook and the August 1992 issue of Dr.
     Dobb's Journal. Privacy applications developed with RSAREF may be
     subject to export controls. If you are located in the United States
     and develop such applications, you are advised to consult with the
     State Department's Office of Defense Trade Controls.

8.   TERM. The license granted hereunder is effective until
     terminated. You may terminate it at anytime by destroying
     the Program and its associated documentation. The termination
     of your license will not result in the termination of the
     licenses of any distributees who have received rights to the
     Program through you so long as they are in compliance with
     the provisions of this license.

9.   GENERAL

     a.   This Agreement shall be governed by the laws of the State of
          California.

     b.   Address all correspondence regarding this license to RSA's
          electronic mail address <[email protected]>, or
          to

               RSA Laboratories
               ATTN: RSAREF Administrator
               100 Marine Parkway, Suite 500
               Redwood City, CA  94065