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CYLINK's Support for Open Public Key Standards

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CYLINK Corporation
March 14, 1996


The following is a copy of an announcement I made in the IPSEC
and PKIX working group sessions at IETF Los Angeles.  In response to 
numerous requests, I am posting a copy of the announcement to the 
applicable IETF working group mailing lists.

-John Kennedy, CYLINK


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CYLINK'S SUPPORT FOR OPEN PUBLIC KEY STANDARDS

EXISTING AND PROSPECTIVE CYLINK LICENSEES OF THE STANFORD PUBLIC 
KEY PATENTS MAY SUPPLEMENT THEIR LICENSES IN ACCORDANCE WITH THE 
FOLLOWING STATEMENT.:


ATTACHMENT "A"


STATEMENT OF PATENT POSITION

Cylink Corporation, through its wholly owned subsidiary Caro-Kann 
Corporation, holds exclusive sublicensing rights to the following 
U.S. patents owned by the Leland Stanford Junior University:

        Cryptographic Apparatus and Method 
        ("Hellman-Diffie")......................... No. 4,200,770

        Public Key Cryptographic Apparatus and Method
        ("Hellman-Merkle").............  No. 4,218,582 

In order to promote the widespread use of these inventions 
from Stanford University and adoption of the [Name IETF Standard] 
reference by the IETF community, [Name of Licensee] has acquired
the right under its sublicense from Cylink to offer the [Name IETF
Standard] reference implementation to all third parties on a royalty free
basis.  

This royalty free privilege is limited to use of the [Name IETF 
Standard] reference implementation in accordance with proposed,
pending or approved IETF standards, and applies only when used with
Diffie- Hellman key exchange, the Digital Signature Standard, or any other 
public key techniques which are publicly available for commercial
use on a royalty free basis.  Any use of the [Name IETF Standard] reference
implementation which does not satisfy these conditions and incorporates 
the practice of public key may require a separate patent license
to the Stanford Patents which must be negotiated with Cylink's
subsidiary, Caro-Kann Corporation.  


For additional licensing information please contact:

        Robert Fougner
        Director of Licensing
        CYLINK Corporation
        910 Hermosa Court
        Sunnyvale, CA  94086
        (408) 735-5893

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