Taking the most sensible meaning of renounce, the court in Micro Star v. Formgen opined exactly the opposite of what you claim: "It is well settled that rights

Taking the most sensible meaning of renounce, the court in Micro Star v. Formgen opined exactly the opposite of what you claim: "It is well settled that rights gained under the Copyright Act may be abandoned." https://casetext.com/case/micro-star-v-formgen-inc https://casetext.com/case/micro-star-v-formgen-inc As for reclaiming a transferred copyright, it's possible, but complicated. It also takes at least 35 years, which is likely too long to be of practical use to most folks.