moodle included non-free content.
See debian bug number "754565".
I think that this bug is problematic, and this bug is affected that package.
1. Remove non-free content and rebuild.
2. Replace Fedora free (Fedora Acceptable Licensed) contents.
3. Remove fedora repos.
Blocking FE-Legal, this is copyright problem.
The sRGB.icc in moodle (2.9) comes from https://packages.debian.org/source/stable/icc-profiles-free, thus, this is not an issue.