That's what's happening at Marvel *right now*. The estates of Marvel founder #StanLee and its seminal creator #SteveDitko are suing Marvel to terminate the transfer of both creators' characters to Marvel. If they succeed, Marvel will lose most of its most profitable characters, including #IronMan:
They're following in the trail of the #JackKirby estate, whom Marvel paid millions to rather than taking their chances with the Supreme Court.
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