History for IPR disclosure
RSA Security's Statement about IPR claimed in draft-ietf-ipsec-properties-00 and draft-jennings-sip-hashcash-00

From: http://www.ietf.org/ietf-ftp/IPR/rsa-ipr-draft-jennings-sip-hashcash-00.txt

Title: RSA Security's Statement about IPR claimed in
      draft-ietf-ipsec-properties-00 and
      draft-jennings-sip-hashcash-00
Received: 30 August 2004
From: Linn, John

RSA Security Inc. has submitted a patent application (US
Serial No. 09/496,824) concerning client puzzles, a technique
initially described in Juels and Brainard, "Client Puzzles: A
Cryptographic Countermeasure against Connection Depletion
Attacks", ISOC NDSS, 1999. As of 2001, discussions within the
IPsec WG had cited this technique and had considered incorporation
of methods with similar properties. Related concepts were referenced
in 2001 in draft-ietf-ipsec-properties-00.txt (relative to which
an IPR disclosure was submitted on 3 August 2001), and more recently
in draft-jennings-sip-hashcash-00.txt. If use of client puzzles is
incorporated into a future Internet standard, and if the currently active
application leads to an issued patent, RSA Security Inc. is willing to
grant licenses to such patent under reasonable and non-discriminatory
terms for purposes of implementing that Internet standard.

Correspondence concerning licensing for this technology should be
addressed to:

RSA Security Inc.,
174 Middlesex Turnpike,
Bedford, MA 01730, USA,
Attn: General Counsel.