As much as it is extremely annoying, they do have the right to claim copyright on any of their content, so there's not much we can do about it.
It is a slap in the face to BB fans though, especially considering that in the past, they've said that they don't mind BB clips being uploaded to YouTube.
They talk about it here:
http://blogs.channel4.com/thetvshow/...nnel-4-online/