Microsoft's protestations of innocence over claims of taking part in a patent blitz against Google have been given short shrift by the search firm's chief legal officer.
David Drummond went public with accusations of collusion between Microsoft, Apple, Oracle and others to use patent claims and legal shenanigans to disrupt the development of Android.
Drummond has quickly fired back, however, calling Microsoft's claims a false "gotcha" and pointing out that Smith failed to answer one of Google's main charges, that Microsoft and others had spent $4.5bn buying patents covering Nortel's remaining intellectual property to use it against Android.
"It's obvious why we turned down Microsoft's offer. Microsoft's objective has been to keep from Google and Android device-makers any patents that might be used to defend against their attacks," Drummond wrote in an update to his original post.
"A joint acquisition of the Novell patents that gave all parties a licence would have eliminated any protection these patents could offer to Android against attacks from Microsoft and its bidding partners.
"Making sure that we would be unable to assert these patents to defend Android - and having us pay for the privilege - must have seemed like an ingenious strategy to them. We didn't fall for it."
Florian Müller, founder of the No Software Patents organisation, told V3 that Drummond is making Google's strategy clear, likening the situation to a Cold War stand-off with patent portfolios equivalent to nuclear arsenals.
"Google is clearly looking for patents that it is free to use against other patent holders," he explained.
"Its patent strategy is centred around 'mutually assured destruction', or to put it less dramatically 'mutually assured damage'. That's why it is only willing to spend money on patents it can assert against those who enforce their patents against Android."
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