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Re: DEPLOY: Microsoft Royalty Free Sender ID Patent License FAQ

On Mon, Aug 23, 2004 at 07:01:00PM -0700,
 Harry Katz <hkatz@xxxxxxxxxxxxxxxxxxxxxx> wrote 
 a message of 457 lines which said:

> For the convenience of the working group, attached is the full text
> of the FAQ.

Reading the FAQ:

> A7: [...] we believe you can distribute your implementation under
> many open source software licenses, [...] Microsoft has not been
> made aware of any specific incompatibilities between any of the
> licenses used to distribute Sendmail, Postfix, or Qmail with
> Microsoft's royalty-free patent license.

There is a big free software licence missing, the GPL (none of the MTA
mentioned uses the GPL. Exim, which does, is not mentioned and I
assume it is not a coincidence).

Taking this into account and reading Eric Allman analysis
(http://www.imc.org/ietf-mxcomp/mail-archive/msg03500.html), it seems
the most common free software licence, the GPL, is incompatible with
Microsoft licence on SenderID.