Bahrain Grand Prix 2013, Sakhir - Race 4/19

It's an anti piracy measure I believe, the number is unique to each viewing card so Sky can see who are running the online streams etc and try to shut them down.

They do it on all the sport channels, see it on the footy all the time.
Ah makes sense. I don't have the other sports channels so haven't noticed it before
 
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