Simple, allow new copyrights on derivative works. Except wait, that's how it already is in America. I'm fine with them redesigning Mickey Mouse for new works. However, it's not cool for them to keep the public domain locked up so that their older works don't enter the public domain—heck, a lot of these are direct adaptations of stories in the public domain. They already have a trademark on Mickey Mouse so its not like other people would start stealing Mickey Mouse.
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