Generally, the title to a single motion picture is not entitled to trademark protection.  This is the same for the title to single books, songs and other singular creative works.  Most non-trademark attorneys are surprised when I tell them this.  I am sure you may be scratching your head as well.  The logic behind the legal principle that the title to a single creative work cannot function as a trademark is as follows:  a title to a single creative work such as a book serves to identify only the book and not the source of that book.  Another reason trademark law generally refuses to acknowledge trademark rights in the title to a single creative work, such as a book, results from the interplay between copyright and trademark law. While trademarks endure as long as the mark is used, copyrights eventually expire. When a work falls into the public domain, others would have the right to reproduce the literary work.  However, if the title to the book enjoyed trademark protection, this would compromise the policy of public domain under copyright law because a book with a trademarked title could only be published under a different title.
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