datahoarder
Who are we?
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
We are one. We are legion. And we're trying really hard not to forget.
-- 5-4-3-2-1-bang from this thread
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They go into more nuance in the comment they linked within the comment I shared which addresses their experience with some of the things you mention, where publishers will change/add things, and that new material changes the public domain status, but others will change minor details and and try to call it a new protected work.
I've seen many guitar tab sights get copyright noticed out of existence, but now playing piano and learning about IMSLP, they seem to be very above board and respectful of the law, so it's interesting to hear of the challenges they face even in trying to comply with established rules.
Things like what IMSLP provide are at least as much educational and historical materials as they are entertainment, and I'm glad they're trying to legally preserve it all. I'll have to look more into their difficulties, it was very interesting reading these 2 posts and their content is very much of interest to me.