There is nothing that you could do, it will force a certain attacker to read them.
Using your own level of encryption at the application level will at least make the problem unique to your application, but someone can still analyze your application code to figure out how to decrypt it.
The copy protection mechanisms on the platform are weaker, because they need to be defeated only once for all applications (for example, by rooting the phone).
Assets used by platform functionality will also be vulnerable to a modified platform configured to upload copies of them.
Do something that is easy to stop by random copying by inexperienced users if you want, but then save your time and energy for battles that you can really win, for example, the quality of your application.
Chris stratton
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