I've read a little discussion on the FDL, which says it might not be the best, because of complexity and saying nothing about possible content like files (pictures, sound, *.blend). Which other licences are possible or is thougt about?

Thanx,
Ingo

Quoted from the official documentation project here:
http://download.blender.org/documentation/html/appendix_licenses.html

Quote:

The Documentation Licenses Open Content License This is the Licence for This Style Guide as well as for the whole Blender Core Documentation. You are kindly requested to produce any contribution to the Blender Documentation Project by using this License. If your contribution is outside Core documentation (as a tutorial, demo .blend file, images or animation) and you wish to use a more restrictive License you can use the the Section called Blender Artistic License.

Thank-you. At the moment it seems that the Blender Artistic License might be the right one: http://download.blender.org/documentation/html/appendix_licenses_bal.html . I will see.

Ingo