Thing is, some time back I bought a £35 cheapie DVD player from LIDL that had USB, SD and CF slots on it. Absolutely no problem playing anything I wanted off of any media that I wanted.
I love my HXD890 and it's a class above in build quality and aesthetics than the LIDL box but they have made some stupid consumer-annoying decisions in the name of token copy protection. If I have downloaded a DiVX then I can burn it onto a DVD or CD and play it on the Sony - how on earth does stopping me do likewise off of a USB device benefit the rights holder?
If they are so worried, why support DIVX on the machine at all; Reason of course is that people would buy competitors machines. So they go out of their way to introduce annoying restrictions on what media it will play the DIVX files from instead