(a) An opposition proceeding is commenced by filing in the Office a timely notice of opposition with the required fee. (b) Any person who believes that he, she or it would be damaged by the registration of a mark on the Principal Register may file an opposition addressed to the Trademark Trial and Appeal Board. The opposition need not be verified, but must be signed by the opposer or the opposer's attorney, as specified in § 11.1 of this chapter, or other authorized representative, as specified in