# File lib/sqs/right_sqs.rb, line 357
      def revoke(permission='FULLCONTROL')
        @queue.sqs.interface.remove_grant(@queue.url, @email || @id, permission)
        unless @email   # if email is unknown - just remove permission from local perms list...
          @perms.delete(permission)
        else            # ... else retrieve updated information from Amazon
          retrieve
        end
        true
      end