The DCO was fetched from https://developercertificate.org/ on Feb 4, 2019. DCO-1.1.txt is a verbatim copy of it. We should carry a copy of this legal document to be explicit on what wording we refer to. A link to the URL is not enough, because it may go stale or change contents without notice. This clarifies on what the S-o-b actually means. The meaning itself is the same as before. Signed-off-by: Pekka Paalanen <email@example.com>1aa3f52f
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