The MIT license doesn't waive any aspect of your copyright and/or moral rights. You still claim to have those rights, however diluted they might eventually beco

The MIT license doesn't waive any aspect of your copyright and/or moral rights. You still claim to have those rights, however diluted they might eventually become. Otherwise it wouldn't make sense to grant some or all of those rights to other people. CC0 on the other hand goes like "I don't have those rights. Nobody does." It falls back to the rights-granting model only in jurisdictions that don't allow unilateral copyright-waiving. In practice, of course, the difference usually doesn't matter. In theory, though, there might be an edge case where it matters, perhaps in situations where the original author's moral rights are involved, or if someone discovers a novel use case for computer code that nobody had imagined before. (Am I allowed to bunch up your code into a virtual snowball and throw it at a virtual alien kid while cursing your name in Klingon?)