Current federal trademark law follows the Lanham Act, otherwise known as the Trademark Act of 1946. Under the Lanham Act, a trademark is "any word, term, name, symbol, or device, or any combination thereof" used in commerce to identify a service or good. Under this definition, it is possible for the names and likenesses of television, film and book characters, fictional accounts, settings, or other elements of entertainment products to act as trademarks. Unlike copyright, however, trademark rights are not automatic. To establish a right in trademark, the rights-seeker must establish that his/her mark acts as a distinctive "source identifier" for a particular type of good or service. Thus, trademark rights may arise when a fictional character's name or likeness may serve to identify the source of an entertainment product or related good. For example, the use of Mickey Mouse's name or likeness may serve to identify a particular book or toy as originating from Disney. One way to establish that a mark acts as a distinctive source identifier is to establish that the relevant purchasing public has developed a strong association between the mark and its originating source. In legal terms, this is known as "secondary meaning."