Follow-up Comment #3, task #14605 (project administration):
If texts sum up to more than 15 lines
<https://www.gnu.org/prep/maintain/html_node/Legally-Significant.html>, they
are copyrightable; it doesn't matter if they are combined with a much larger
body of code.
Orphan works is a well-known issue of current copyright system; you have to
either rewrite those pieces or get a permission from the legal successors.
Yes, if someone contributed ideas but not actual texts, you should write so
rather than add a copyright notice for them.
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