The copyright for this story has expired in the United States and, thus, resides in the public domain there. The text is available from Project Gutenberg and Wikisource. In anticipation of the 2012 Disney film John Carter, Edgar Rice Burroughs, Inc. trademarked the phrases "John Carter of Mars", "Princess of Mars", and "Barsoom", among others, despite the Dastar decision of the United States Supreme Court, which invalidates trademark on public domain works.
Except for Guatemala, Honduras, Samoa, Saint Vincent and the Grenadines, Colombia, Equatorial Guinea and Mexico, Burroughs' works, including A Princess of Mars, has entered public domain in the rest of the world.
