In version 4.9 the transcoding of iTunes files even when expiry date was over the files could be transcoded.
In version 5.0 it just displays the screen that it has expired and the date of it.
Also forward and rewind during transcoding is not working anymore. In 4.9 you could select the time from dropdown menu and the player will jump to that time. In new version it does nothing it always starts from beginning.
Note:
After do some checking it was not DRM the problem is that the file contained two audio streams one was normal the other was just silent. Also it has contained two video streams one the video and the other note that the video has expired.
Since subsonic do not have (or i can not find it) the option to select the stream for video and audio it has took the one with silent track and with warning and not the one with real video and sound.
If there would be an option to select the video and audio track everything would be solved.