Despite the changes, the new specification still might not satisfy open-source software advocates, who are still concerned about Microsoft's patent claims and its ultimate plans for Sender ID and the larger problem of proliferating IP (Internet protocol) patents in the technology sector, Meng said.
Sundwall said that the proposed Sender ID license satisfied groups such as the World Wide Web Consortium and the American National Standards Institute (ANSI), and that was enough for Microsoft -- even if groups such as the Free Software Foundation continue to oppose Sender ID.
Microsoft also took pains to clarify language in one of its Sender ID patent claims that some critics interpreted as encompassing SPF mail-from checks, in addition to PRA checks, Sundwall said.
An "experimental RFC" (Request for Comment) version of the Sender ID specification should be published by IETF by the end of the year, Meng said, but he doesn't expect it to end up for consideration by a working group again.
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