[android-developers] PDF library app

I feel like this question has come up over and over again based on my googling, but I still can't figure out how to pull this off. I have a set of copyrighted PDFs which I would like to package inside some kind of "bookshelf" application. But I would like them to remain reasonably protected. I've

[android-developers] displaying internal PDF assets

I need to display a set of PDF files from within my Android application. I'm trying to figure out the Android security system and whether or not content providers will work. It seems that calling grantUriPermission() would be a good idea, but I'm having problems figuring that out. Do I need to get