I actually once had a job researching all of the old Disney copyrights. Even back in 199(4?) there was already one that had fallen out of copyright—I believe it was a Silly Symfonie.

IANAL, but my understanding after doing all that research is that the copyright is only for the actual movies themselves. The characters are trademarked, so nothing can be done with them outside of the context of the films. Think cheap collections of short films on DVDs at the grocery store. That’s the extent of what I would expect to see when the films go into public access.