Pretty much. Pedantically speaking, you can't transfer all rights. Urheberrecht always stays with the author. But Urheberrecht isn't copyright. (Over)simplified

Pretty much. Pedantically speaking, you can't transfer all rights. Urheberrecht always stays with the author. But Urheberrecht isn't copyright. (Over)simplified, it codifies who owns the copyright of a work initially, and that owner can transfer the copyright.