Streaming Videos downloaded with iTunes

I've bought a video from iTunes (it's not available anywhere else as download). I have imported the iTunes Library to Mezzmo. But my Sony Blue Ray Player cannot play it.

I assume it's because of the DMR. Mezzmo tries to transcode it for the Blue Ray Player, but this does not work?

Is there a possibility to stream a DMR video downloaded via iTumes (Format .m4v) via Mezzmo?

If the device doesn't support that format then unfortunately no - we (FFmpeg) cannot decode DRMed material. Generally Sony BDPs do not support MP4 files, but you could try to turn transcoding off and see if it streams or not.