Okay, looking at the PBS and UK containers I can see that there is a compiled executable in there that looks to play the original feed and rebroadcast it or something. It's using widevine library I'm guessing that's ripped out of ChromeOS (and why they aren't publishing their code for these two projects).
That's just my guess. I'm sure @miibeez could clarify for us.
The issue with this solution for E+ is that I'm guessing Google doesn't like rehosting the widevine.so files, and on top of that getting those working on x64 and ARM CPUs is kinda a crapshoot.