Also unknown to most, is the useage of individual state laws in the copyright. This is copied from the US Copyright office, FAQ:
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.
Therefore, it may be legal in one state, and not in another. Interesting...I wasn't aware of the state laws!