He gave the same talk at several locations (not just DEFCON and Google) - I linked the DEFCON 20 version because I think it is slightly better in a couple place

He gave the same talk at several locations (not just DEFCON and Google) - I linked the DEFCON 20 version because I think it is slightly better in a couple places, due to the security-focused audience. I believe they are largely the same, with only a couple minor differences.