Article 11

If, as a condition of protecting the rights of producers of phonograms, or of performers, or both, in relation to phonograms, a Contracting State, under its domestic law, requires compliance with formalities, these shall be considered as fulfilled if all the copies in commerce of the published phonogram or their containers bear a notice consisting of the symbol

, accompanied by the year date of the first publication, placed in such a manner as to give reasonable notice of claim of protection; and if the copies or their containers do not identify the producer or the licensee of the producer (by carrying his name, trade mark or other appropriate designation), the notice shall also include the name of the owner of the rights of the producer; and, furthermore, if the copies of their containers do not identify the principal performers, the notice shall also include the name of the person who, in the country in which the fixation was effected, owns the rights of such performers.