For version 3.x and higher, the manual can be found dual licenced under the GNU GPL and under GNU Free Documentation License 1.2 on our wiki: https://gramps-project.org/wiki/index.php?title=User_manual

For version 2.x, the manual can be found in maintenance/gramps23 branch of the GIT repository, under the GNU GPL license.

As such, this manual meets the criteria of Debian Free Software Guidelines 
(DFSG) and can be distributed through Debian main (as opposed to non-free).

Please see file named COPYING for exact terms of the license.

Benny Malengier
January 15, 2008