docs: def set_copyright(self, copyright=None):
          """Sets the copyright.
  
          :param copyright: the new copyright
          :type copyright: ``string``
          :raise: ``InvalidArgument`` -- ``copyright`` is invalid
          :raise: ``NoAccess`` -- ``Metadata.isReadOnly()`` is ``true``
          :raise: ``NullArgument`` -- ``copyright`` is ``null``
  
          *compliance: mandatory -- This method must be implemented.*
  
          """
          if copyright is None:
              raise NullArgument()
          metadata = Metadata(**settings.METADATA['copyright'])
          if metadata.is_read_only():
              raise NoAccess()
          if self._is_valid_input(copyright, metadata, array=False):
              self._my_map['copyright']['text'] = copyright
          else:
              raise InvalidArgument()