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It's not like you could take the neural net weights aggregated from thousands of movies and retrieve any form of entertainment from them. Is a derived work anything at all based on an original, or just something in the similar field, ie entertainment->entertainment?

My own personal definition is whether the derivative work could survive if the first work did not exist, not for which purpose it was intended to be consumed. Not sure about the legal definition.

Legally, there is a huge gradient between length(work), sha(work), train(transcription(work)), transcription(work), thumbnail(work), etc. Your personal definition of "derived" sounds a lot like the mathematical definition, which isn't amazingly useful in a copyright context.

> Not sure about the legal definition.

Perhaps stating "You certainly couldn't release such a model under the GPL." so surely isn't a great idea?

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