Things get a little more murky where we're talking about "downloads" as opposed to "broadcasts" - both the BBC and theit regulator, Ofcom, have confirmed on numerous occasions that it's mandatory that the BBC's "public service content remains free to air i.e. unencrypted." ( http://news.bbc.co.uk/1/hi/technology/8352241.stm ) but they've been allowed to place limits on downloaded content such as iPlayer not letting you store content forever.
I suspect this is less about "BBC wants DRM" and more about "BBC is under massive pressure to use DRM"
Either way, I was disappointed when I first saw their submission to W3C talking about their support for DRM'd media - I've always been gratified by the way the BBC was the only big media corp. out there that wasn't chasing the dream of total control over its content. If they're making a U-turn on that I'll have to rethink my policy on paying the license fee.
(Before anyone steps up with the "it's mandatory" - it isn't if you don't own & use a TV, and I'd feel no sorrow at all about getting rid of my TV)