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Russ Cox authored
CC-BY-3.0 was shiny and new back in 2009, but CC-BY-4.0 is generally preferred now. Update our CC-BY uses to CC-BY-4.0. Google lawyers signed off on the overall CC-BY-4.0 update and Renee French signed off on the update of the gopher license. See also CL 447156. Change-Id: I3908910d6011ed733271e595f761c773351b30f7 Reviewed-on: https://go-review.googlesource.com/c/go/+/447275 TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Russ Cox <rsc@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Run-TryBot: Russ Cox <rsc@golang.org>
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