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Update Developer Policy for copyright notices (#123463)

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This updates the developer policy to align with established community
norms for copyright notices in source code contributed to LLVM.

The updates clearly state that we do not accept code contianing explicit
copyright notices in source except where such code is a pre-existing
part of an external dependency that is being vendored into LLVM.

Explicit copyright notices in source add no value to the project since
copyright ownership is well tracked through git. Our policy already
requires that contributions made not by the original author have
appropriate attribution in git commit messsages or metadata.

Further, explicit copyright notices in code can easily get out of date
as the code is refactored, updated by additional authors or otherwise
changed over time. This leads to misleading out-of-date copyright
notices which do more harm than good.

This change should be viewed as a clarification and statement of
existing established policy, not a change in policy since it represents
the way the project has been operating.
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Chris B 2025-01-21 15:48:27 -06:00 committed by GitHub
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llvm/docs/DeveloperPolicy.rst
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@ -1154,6 +1154,18 @@ acceptable for their contributions. We feel that a high burden for relicensing
is good for the project, because contributors do not have to fear that their
code will be used in a way with which they disagree.
Embedded Copyright or 'Contributed by' Statements
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The LLVM project does not accept contributions that include in-source copyright
notices except where such notices are part of a larger external project being
added as a vendored dependency.
LLVM source code lives for a long time and is edited by many people, the best
way to track contributions is through revision control history.
See the `Attribution of Changes`_ section for more information about attributing
changes to authors other than the committer.
Relicensing
-----------