(1) Subject to any agreement subsisting between the parties, a registered user may institute proceedings for infringement in his own name as if he were the registered proprietor, making the registered proprietor a defendant and the rights and obligations of such registered user in such case being concurrent with those of the registered proprietor.
     (2) Notwithstanding anything contained in any other law, a registered proprietor so added as defendant shall not be liable for any costs unless he enters an appearance and takes part in the proceedings.