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IPR Details
VeriSign, Inc.'s Statement about IPR related to draft-harvey-cfrg-mtl-mode

Submitted: July 19, 2023 under the rules in RFC 8179.

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.


Updated by

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

Holder legal name VeriSign, Inc.

II. Patent Holder's Contact for License Application

Holder contact name VeriSign, Inc., Law Department
Holder contact email
Holder contact info

VeriSign, Inc.
Law Department
12061 Bluemont Way
Reston VA 20190

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

Name Scott Hollenbeck
Other info

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

draft-harvey-cfrg-mtl-mode ("Merkle Tree Ladder (MTL) Mode Signatures")
No revisions for this Internet-Draft were specified in this disclosure. The Internet-Draft's revision was 00 at the time this disclosure was posted. Contact the discloser or patent holder if there are questions about which revisions this disclosure pertains to.

V. Disclosure of Patent Information
i.e., patents or patent applications required to be disclosed by RFC 8179

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

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

Number: US18/219522
Inventor: Burton Kaliski, Joseph Harvey, Swapneel Sheth, Andrew Fregly
Date: 2023-07-07

B. Does this disclosure relate to an unpublished pending patent application?:

Has patent pending Yes

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):

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

Verisign is owner of U.S. Provisional Patent Application Nos. 63/429,093, 63/416,909, 63/406,699, and 63/356,973 and U.S. Patent Application Nos. 18/219,522, 18/137,992, and 18/137,966 (collectively, the "Patent Applications" or “Intellectual Property”) relating to the subject matter of the Internet Draft entitled “Merkle Tree Ladder Mode (MTL) Signatures” and any successive versions deriving therefrom (collectively, the "I-D").

In furtherance of IETF standardization, it is Verisign's business practice to make licenses to its Intellectual Property available on fair, reasonable, and nondiscriminatory terms and conditions.

Accordingly, Verisign hereby declares the listed Intellectual Property that may Cover an Implementing Technology of the I-D, with an additional Licensing Declaration and terms to be provided later if the listed Intellectual Property would necessarily be infringed by the Implementing Technology ("Necessary Patent Claims"), which implies a willingness to commit to the provisions of a) under a royalty-free and otherwise reasonable and non-discriminatory license (e.g., with terms to include attribution and/or a covenant not to sue with or without defensive suspension as described in Section 7 of BCP 79), or b) under a license that contains reasonable and non-discriminatory terms and conditions (e.g., with terms to include attribution and/or a covenant not to sue with or without defensive suspension as described in Section 7 of BCP 79), including a reasonable royalty or other payment, or c) without the need to obtain a license from Verisign (e.g., a covenant not to sue with or without defensive suspension as described in Section 7 of BCP 79).

Standards Development Grant

Verisign grants to any party a world-wide, non-exclusive, royalty-free license under said Intellectual Property to make, use, and/or import products and/or services that implement such I-D for the sole purpose of facilitating the standardization of such I-D;
provided, (A) any such party making, using, and/or importing such products or services, shall include therein, or shall ensure that such has been included therein, an attribution notice as set forth below, and

further provided, (B) Verisign retains the right to terminate the above license and assert its Intellectual Property (including one or more claims of said Intellectual Property that would necessarily be infringed due to requirements for practicing the normative portion(s) of the I-D (each an "Essential Claim")) against any party that institutes or agrees to institute patent litigation (including cross-claims or counterclaims in a lawsuit), either directly or indirectly, against Verisign or any of its affiliates or licensees for making, using, selling, offering for sale, and/or importing products and/or services that implement the I-D.

The Standards Development Grant will terminate upon the earlier of either expiration of the I-D or when the I-D is included in any Request for Comments (“RFC”) adopted by the IETF.

Attribution Notice for Standards Development Grant:

"This product is licensed under certain patents and/or patent applications owned by VeriSign, Inc. in furtherance of IETF standardization. For more information, visit"

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 Scott Hollenbeck
Submitter email

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