Back to the basics ..... The issue of copyrighted file formats, menu command hierarchies, commands, and similar was determined in the landmark case of Lotus Development Corporation v. Borland International before the U.S. Court of Appeals for the First Circuit, No. 93-2214 and affirmed by the U.S. Supreme Court, No. 94-2003. The courts held that file formats, menu command hierarchies, commands, and similar are uncopyrightable "procedures" or "methods of operation". The Supreme Court previously explained in an earlier case: "The primary objective of copyright is not to reward the labor of authors, but to promote the Progress of Science and useful Arts. To this end, copyright assures authors the right to their original expression, but encourages others to build freely upon the ideas and information conveyed by the work." This means you can copyright the arrangement of commands, but not the commands or the file format.