Wrong: Copyleft ensures that the users of a given program can get access to its source code and release modified version of it, and that the users of that modif

Wrong: Copyleft ensures that the users of a given program can get access to its source code and release modified version of it, and that the users of that modified version have the same rights to access, modify, release it, and so on. Without copyright, there would be no way to enforce this preservation of user rights.