Comment file ex parte to the patent examiner (Score 1) 187
This sounds pretty convincing that it's a copy. You can tell the patent examiner about the prior art. You don't have to sue or be sued. The only defense Tandberg could claim is they actually told you about the idea, and you "stole" it when you committed the code. They would have to show evidence to the examiner to rebut his rejection based on your ex parte evidence.