Are sendmail-license (used by mail/sendmail* and mail/libmilter) and sendmail-open-source-license (used by mail/dk-milter, mail/dkim-milter) sufficiently different to keep them both? Running textproc/wdiff over both licenses shows that the difference is mainly in word choice, punctuation and capitalisation. Both {dk,dkim}-milters packages, although hosted by Sourceforge, are from Sendmail Inc as well, and I don't think the licenses are intentionally different. (Currently, to build these, you have to accept both licenses, due to their dependency on libmilter.) They seem different enough that I'm a bit nervous about this. Perhaps this could be brought to the attention of the sendmail people and they could be asked to fix it? We could also put both licenses in the sendmail-license file with a comment that they are similar and being treated in aggregate. The sendmail website is stunningly devoid of any useful licensing information. It's interesting that it's called an 'open source' license, but it does not appear approved by FSF or OSI. The license is unusual; it seems to be that one can give binaries at no charge, or GPL-like with no rules on charging. But it does seem to be Open/Free, or at least intended to be. So I wonder if we've asked them to submit it for approval, and where Debian stands on DFSG compliance of the licenses. I'd be happy to drop them a note asking for clarification and if they've submitted the licenses for approval.
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