What does it mean if a mobile app's use of encryption is "Limited to intellectual property and copyright protection"? Does that mean it doesn't contain any encryption that is patentable?
What it probably means from a technical perspective is that things made with the app are given an identifying tag that can be used to determine the source of what is made with the app, much like the source ID text that follows a URL copied from lots of media websites.
This source ID could be used to show that the source of the material produced by the app was produced by that app by a particular user, so that if the app user was infringing a copyright or other intellectual property, copies derived from the infringing use could be determined.
Also, while this is the stated purpose, usually tags like that are actually primarily use to facility "smart ads" in an Internet advertising system.
The limitation means that the security protocols used by the app don't encrypt the content in a manner that prevents someone else with even minimal IT skills from decoding the content and that the security isn't meant for that purpose.