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/usr/share/doc/grub-common/copyright is in grub-common 1.99-21ubuntu3.19.

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The actual contents of the file can be viewed below.

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Name: GNU GRUB
Source: http://www.gnu.org/software/grub/

Files: *
Copyright: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation, Inc
License: GPL-3+


Files: debian/*
Copyright: 2003, 2004, 2005, 2006, 2007, 2008, 2009, Robert Millan
	   2005, 2006, 2007, Otavio Salvador
	   2008, 2009, Felix Zielcke
	   2009, Jordi Mallach
License: GPL-3+

Files: debian/grub-extras/*
Copyright: Nathan Coulson
           2003, 2007  Free Software Foundation, Inc
           2003  NIIBE Yutaka
License: GPL-3+

License: GPL-3+
 On Debian systems the full text of the GNU General Public
 License can be found in the `/usr/share/common-licenses/GPL'
 file.