Efectivamente, es un problema de patentes. Pero tú mismo puedes instalarte un parche para saltarte la patente.Para ello, lee atentamente este hilo y sigue sus instrucciones y tendrás DTS True HD (Master) en tu ampli.
I succeeded using the following method:
Put the bluecore.fwp (september 2010 version) on a USB stick
Put the USB stick in the usb port (I used the one on the side of my S1)
Go to Movies and navigate to the USB drive. You will see the firmware with a F/W logo on it.
Click it for a popup, something about internal testing only, and click ok.
The machine will reboot and you're all done.
I tested Dolby TrueHD, DTS-HD MA 48Khz and 96Khz, all worked fine.
http://www.mpcclub.com/forum/showthread.php?t=25592