Why can't I burn a SPN episode to disk?

[tenaya]

I tivo'd Lucifer Rising and just watched it. A friend I'll be seeing at MediaWest Con, her VCR didn't capture the sound and now she'd like to see the episode, so I thought I'd burn a copy. The first half recorded fine, but it won't record the 3rd quarter hour for about the first 3 minutes. It tells me: "Copy-protected. Cannot record."

Is there a way to get around this? How long has this been going on?