When we asked the lawyers for the simplest possible answer:
(For the most part) YOU are the owner of the content you create (“Content”) using the Mindshow App! Mindshow (or its licensors) owns the characters, props, and backgrounds (“Digital Assets”) provided in the App to help you tell your story. We give you a license to use the Digital Assets, and you give us a permanent and irrevocable license to (i) make the Content available for display, exhibition, and distribution through the Mindshow App and (ii) permit other users to make their own remixes of your Content. See Section 7 of the End User License Agreement for more information.