And there's absolutely no DRM on OTA digital broadcasts. The industry tried to add some by asking the FCC to mandate a "broadcast flag", but that went nowhere. OTA signals are DRM-free - some *may* have the flag in a vain hope that the receiving hardware will respect it, but no currently-produced receiving hardware that I know of does. And I doubt any of the stations bother even inserting the flag anymore.
Is this really true? I've been reading the AVR Forums for the last few months and apparently there are a lot of situations where the Broadcast Flag is being set. You wouldn't think that this is a problem, except that a lot of the DVD recorders on the market today do honor the flag and will only record programs that have it set onto DVD-RAM media (since that's the only media which supports recordable content rights managment). This has caused a lot of DVD recorder owners heartburn when they try to use DVD+/-R/W media and the recorders refuse to write to it when they spot the broadcast flag set.
In fact one of the most annoying situations is when the main program _doesn't_ have the flag set, but one of the commercials _does_. Then the recorders will bail out partway through the session when they see the flag set on the commercial.
The explanation requiring the fewest assumptions is the most likely to be correct. -- William of Occam