@abc.abstractmethod<EOL><INDENT>def set_license(self, license_):<DEDENT>
pass<EOL>
Sets the license.

        :param license: the new license
        :type license: ``string``
        :raise: ``InvalidArgument`` -- ``license`` is invalid
        :raise: ``NoAccess`` -- ``Metadata.isReadOnly()`` is ``true``
        :raise: ``NullArgument`` -- ``license`` is ``null``

        *compliance: mandatory -- This method must be implemented.*