I haven't been able to find out much from Amazon on how their DRM works or how to even implement it, nor can I find any documentation worth a damn on it at all.
Does Amazon alter the APK themselves or is this something the developer has to do?
Is there some decent doc (designed for developers) explaining it? Please post link if you have it.
You don't have to do anything but check the DRM checkbox when uploading your appliaction.