Hello all,

I am ziproot, a contributor to the video game Endless Sky, which has been on 
Debian repos in the past. I have a few questions concerning copyright.

1. Endless Sky’s source code is licensed under the GNU General Public License 
v3 or later, however, there are images licensed under CC-BY-SA 3.0, CC-BY-SA 
4.0, and the Unsplash License. Is this a violation of the GPL?

a. There are some binaries, such as an AppImage, which are packaged with the 
compiled source code and all of the images. Would this violate the GPL, or is 
this considered an aggregate? If this does violate the GPL, what would be 
necessary to make it GPL compliant? In other words, what images would need to 
be removed, or if possible, what would be necessary to include both the assets 
and the source code as licensed?

2. Are these licenses allowed in Debian repos? If not, which ones are not, and 
would it be possible to include Endless Sky in the contrib and/or non-free 
repos instead?

If you are unfamiliar with the Unsplash License, its terms are here: https://
unsplash.com/license/

If you wish to view the game's repository for more information, you can do so 
here: https://github.com/endless-sky/endless-sky/

Thank you for your support.

Best regards,
ziproot

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