/usr/share/doc/gnuchess-book/copyright is in gnuchess-book 1.02-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | This is the opening book of gnuchess. It used to be distributed
together with gnuchess up to version 5.02. The Debian package was
prepared by Lukas Geyer <lukas@debian.org>
Upstream location of the book is
ftp://ftp.gnu.org/pub/gnu/chess/book_1.02.pgn.gz
This opening book is in the public domain. It was put together and
cleaned up by Stuart Cracraft <cracraft@earthlink.net> and Simon
Waters <simon@wretched.demon.co.uk>. Stuart wrote the following in
email, when asked about copyright.
I personally built the GNU Chess book from a large set of FREE
game collections from the University of Pittsburgh chess server.
These are NOT copyrighted and are PUBLIC. I also wrote the code
for the GNU Chess book without any reference at all to any other
author.
It is GNU Chess code and PUBLIC book that is non-copyrightable.
--Stuart
Note that all the code is in gnuchess, so this package itself is
purely public domain.
Lukas Geyer <lukas@debian.org>
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