I think commercial, doujin/indie, and bootleg covers everything pretty well, so I don't have too much to add.
- Commercial: An album released on a commercial record label by the official rights holder.
- Doujin/Indie (Indie/Doujin, !Commercial, whatever you want): An album released by an independent record label, doujin circle, individual artist, etc.
- Bootleg: Unauthorized reproductions or compilations without any original content, sold by a business entity.