Sure that is true, but Company A would do the same. The guy who owns Company A wouldn't have all the copyrights in his name. They would be in the companies name. If they were in his name, Company B wouldn't want to buy Company A because Company A has not value without the copyrights. If Company B did buy Company A for other assets and the copyrights were kept in Guy A's name. Company B would have no right to them.
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www.copyright.gov. Actually, there is no clear rule here. It basically says that the transfer of copyrights is done by contract. So whatever is agreed to between two parties is legal. This could be both retain full rights, partial rights, one has no rights, etc... So this would be really ugly to figure out. On a ROM by ROM basis, you would have to track a ROMS ownership back to the source and find all the agreements in place that govern that ROM. Some companies may have chosen to retain some of their titles while getting rid of others. Not only that, if the transfer isn't exclusive, you don't even have to have anything it writing. Also, everything is subject to state law. So different states could have different interpretations of ownership.
"Any or all of the copyright owner's exclusive rights or any subdivision of those rights may be transferred, but the transfer of exclusive rights is not valid unless that transfer is in writing and signed by the owner of the rights conveyed or such owner's duly authorized agent. Transfer of a right on a nonexclusive basis does not require a written agreement.
A copyright may also be conveyed by operation of law and may be bequeathed by will or pass as personal property by the applicable laws of intestate succession.
Copyright is a personal property right, and it is subject to the various state laws and regulations that govern the ownership, inheritance, or transfer of personal property as well as terms of contracts or conduct of business. For information about relevant state laws, consult an attorney.
Transfers of copyright are normally made by contract. The Copyright Office does not have any forms for such transfers. The law does provide for the recordation in the Copyright Office of transfers of copyright ownership. Although recordation is not required to make a valid transfer between the parties, it does provide certain legal advantages and may be required to validate the transfer as against third parties. For information on recordation of transfers and other documents related to copyright, request Circular 12, "Recordation of Transfers and Other Documents."