Google on Monday said it had made a strategic bid on Nortel's patent sale to protect Android. A "stalking horse" bid chosen by Nortel has put a minimum price of $900 million and is meant to discourage patent trolls, as well as anti-Android rivals like Microsoft and Oracle, from making relatively casual bids that let them attack the mobile OS further. Patent law was broken, and either acquiring the patents or forcing the price up was the best way of discouraging lawsuits meant solely to keep a competitor down.