[rupor]

Originally Posted by Morkl

Yes, but all apps sharing a user ID must be signed with the same key Perhaps the actual file permissions can be changed, but then I'd have to make sure they aren't overwritten.

Why not to sign your app with the same key Sony does? To the best of my knowledge they are using testing keys from CyanogenMod project, you just have to be careful which key to use with which application (see keys.txt in my SVN), that all. If you will re-sign EbookSettings - your reader may start working, but other applications will lose - or are you going to re-sign all of them?