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/usr/share/doc/cramfsswap/copyright is in cramfsswap 1.4.1-1.

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This package was debianized by Juliane Holzt <debian@julijane.de> on
Tue,  4 Jan 2005 12:26:00 +0100.

This is a native debian package, debian maintainer and upstream author are
the same person. The source can be downloaded from 
http://kju.de/projekte/cramfsswap/ (sorry, German only)

License:

cramfsswap is released under the GNU GPL license as free, open source
software. Hopefully it will seem useful to someone. NO WARRANTY. GPL2
only! On Debian GNU/Linux systems, the complete text of the GNU General
Public License can be found in '/usr/share/common-licenses/GPL'.