IANAL, but I think open source started with software since software has source and binary form. Now with compression and other shenanigans, probably even videos or images could be argued to have a source and binary form. I don't know a thing about multimedia, but people here saying this "open source" release is a good thing mention specifically the fact that it's the uncompressed version, or as the FSF would call it, "the preferred form of the work for making modifications to it".
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