About software licensing........
Suppose I've got a wallpaper or two licensed under the CC BY-SA 2.0 licence ( http://creativecommons.org/licenses/by-sa/2.0/legalcode ), and I want to include it in a (deb) package that I intend to license under the GPL 3 (and CC BY-SA 2.0 isn't compatible with the GNU GPL, see https://www.gnu.org/licenses/license-list.html ).
Would something like that be OK?
This should not be a problem because a package is like a database work or an aggregate. The debian package manager allows you to specify a licence for each file.
Thanks.
What do you want to license under the GPL? Some other software in the
same package? Then it's "aggregate" (or "collective work"), not a
derived work: it's ok to use incompatible licenses for these.
Early Creative Commons licenses have some wording issues that make them
Debian-nonfree [0]: you might want to modify it and license your
modified version under CC BY-SA 3.0 or 4.0 (see 4b in CC BY-SA 2.0).
[0] https://wiki.debian.org/DFSGLicenses#Creative_Commons_Attribution_Share-Alike_.28CC-BY-SA.29_v3.0
A deb package with Mint's Nadia-extra and Rebecca wallpapers.