Well, yeah, it can be done.
I'm just not too optimistic about it when the most common method is to transcode the file. Transcoding from lossy to lossy is never a good idea and I hate how common it is in the Asian music scene. As long as the bitrate looks big, people don't care how it sounds.
The best way would be to remove the DRM from the protected AAC files using an external app, but I don't know if there are any apps like that still being actively developed and maintained since projects like that are usually spearheaded by Westerners. If someone could tell me of one (maybe via PM as I don't know if it's allowed to link to stuff like that) I'd be interested.