IPR Details
Philip R. Zimmermann's Statement about IPR related to draft-zimmermann-avt-zrtp-22

Submitted: February 7, 2011 under the rules in RFC 3979 as updated by RFC 4879

Note: Updates to IPR disclosures must only be made by authorized representatives of the original submitters. Updates will automatically be forwarded to the current Patent Holder's Contact and to the Submitter of the original IPR disclosure.



I. Patent Holder/Applicant ("Patent Holder")

Holder legal name
Philip R. Zimmermann

II. Patent Holder's Contact for License Application

Holder contact name
Philip R. Zimmermann
Holder contact email
Holder contact info

115 Harvard St
Santa Cruz, CA 95060 USA
T: +1-831-425-7524

III. Contact Information for the IETF Participant Whose Personal Belief Triggered this Disclosure

Philip R. Zimmermann
Other info

115 Harvard St
Santa Cruz, CA 95060 USA
T: +1-831-425-7524

IV. IETF Document or Other Contribution to Which this IPR Disclosure Relates

draft-zimmermann-avt-zrtp ("ZRTP: Media Path Key Agreement for Unicast Secure RTP")
Revisions: 22

V. Disclosure of Patent Information i.e., patents or patent applications required to be disclosed by RFC 3979 as updated by RFC 4879

A. For granted patents or published pending patent applications, please provide the following information:

Patent, Serial, Publication, Registration, or Application/File number(s)

US Patent number 7730309
Date: Applied for July 27, 2006
Country: USA

Notes: Provisional patent application filed in July 2005

B. Does this disclosure relate to an unpublished pending patent application?:

Has patent pending

VI. Licensing Declaration

The Patent Holder states that its position with respect to licensing any patent claims contained in the patent(s) or patent application(s) disclosed above that would necessarily be infringed by implementation of the technology required by the relevant IETF specification ("Necessary Patent Claims"), for the purpose of implementing such specification, is as follows(select one licensing declaration option only):

See Text Below for Licensing Declaration
Licensing information, comments, notes, or URL for further information

License Grant

At this time, Philip Zimmermann (together with his assignee, "PRZ") believes US Patent Number 7730309 ("0309") contains claims which may be necessary and essential to implementations of the IETF RFC based on the ZRTP specification draft-zimmermann-avt-zrtp.

Subject to the terms and conditions of this License, PRZ hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this License) patent license to 0309 to the extent that 0309 is infringed by Your implementation (in whole or in part) of this specification or its successor documents published by the IETF.

If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the implementation of the specification constitutes direct or contributory patent infringement, then any patent license for the specification granted to You under this License shall terminate as of the date such litigation is filed.

If You assert, in litigation (including a cross claim or counter claim in a lawsuit) or otherwise (including in a licensing discussion) any patent rights against either Philip Zimmermann or his assignee, then any patent license for the specification granted to You under this License shall terminate immediately.

If the "ZRTP Disclosure Flag" in the ZRTP specification is applicable to Your implementation, and You knowingly fail to properly implement it in a truthful manner, and You are informed of this fact and fail to remedy it within 90 days, then any patent license for the specification granted to You under this License shall terminate.

Note: The individual submitting this template represents and warrants that he or she is authorized by the Patent Holder to agree to the above-selected licensing declaration.

VII. Contact Information of Submitter of this Form

Submitter name
Philip R. Zimmermann
Submitter email

VIII. Other Notes

Additional notes

For further information, see http://philzimmermann.com/zfone

Only those sections of the relevant entry form where the submitter provided information are displayed.