UPDATE (11/Oct/2012): the latest BUZZ Player and Good/PowerPlayer updates removed AC-3(A52), E-AC-3 and TrueHD(MLP). The developers of GoodPlayer stated (link) the patent holder asked for quite a lot money for the license. I've asked the developers whether the decoder(s) could be provided as optional In-App Purchases. HustMobile answered it might be possible.