Just a guess, but it has the feel of a flawed source database of what's been copyrighted. Something like a source where if one file in a collection is actually

Just a guess, but it has the feel of a flawed source database of what's been copyrighted. Something like a source where if one file in a collection is actually copyrighted, the entire folder/files/collection is assumed to also be copyrighted. And then, each file then goes in a database with a hash, etc. That would account for this issue, and the earlier one where files with just a one/two/three digit number in them triggered the copyright hammer.