I’ve actually created a rickroll myself, just now. I’ve uploaded it to Youtube and it’s still processing.

Next to its icon, it says "Matched third-party content". Clicking the link brings me to a page that says it contains content that is owned by SonyBMG, but that they have allowed distribution of this content in return for being made aware of its ratings and statistics.

So, that gives you some indication of how good Youtube’s content detection is (or its Rickroll detection is!) and that SonyBMG doesn’t mind the song being used in this way.

Oh, it’s a great Rickroll!

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