Hello,
You can use the part if you like, but the part is not recommended for new designs because we cannot support it for new designs. If you have problems, we won't be able to help you with that part-- what is available as documentation is all there is.
HDCP doesn't matter on the transmitter anyway-- you can't decrypt with it. If there are no keys, it doesn't matter what you do with MCL and MDA.
Dave