Update COPYRIGHT

[shoffman-percona]

Need to modify the existing license to include the portions of code unique to Percona

[it-percona-cla]

All committers have signed the CLA.

[dutow]

@shoffman-percona for now pg_tde has a separate license file: https://github.com/percona/postgres/blob/TDE_REL_17_STABLE/contrib/pg_tde/LICENSE

And 99% of our work is in that folder, we made very little changes to the postgres server itself. Should we keep that?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.28%. Comparing base (784e45d) to head (7c83d81).
Report is 1 commits behind head on TDE_REL_17_STABLE.

❌ Your project status has failed because the head coverage (80.28%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           TDE_REL_17_STABLE     #317      +/-   ##
=====================================================
- Coverage              80.29%   80.28%   -0.01%     
=====================================================
  Files                     22       22              
  Lines                   2578     2577       -1     
  Branches                 396      395       -1     
=====================================================
- Hits                    2070     2069       -1     
  Misses                   428      428              
  Partials                  80       80              

Components	Coverage Δ
access	82.77% <ø> (ø)
catalog	87.47% <ø> (ø)
common	91.80% <ø> (ø)
encryption	75.70% <ø> (ø)
keyring	71.83% <ø> (ø)
src	66.74% <ø> (ø)
smgr	96.96% <ø> (-0.04%)	⬇️
transam	∅ <ø> (∅)

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[jeltz]

Maybe it is better to jsut have the top-level copyright file since it could be argued that contrib/pg_tde partially is a derviate work from PostgreSQL. Though maybe that is a question for legal.

[shoffman-percona]

Ahh! license theory! The PG license is unrestricted on derivative works...we can license under any terms we want for our unique code but if we used code from PG anywhere in that directory we can't magically relicense it to our desires...the files with the copied code would need to retain the PG license header. In this case it's worth a conversation on "do we get anything from the MIT license that we don't get from the PG license" as I think it makes it cleaner. Will take it up with Kai next week, this PR can move forward though.