Back in 2005 when Philips sold out its audio fingerprinting technology to US firm Gracenote and took a stake in it, it seemed like Philips was getting out of content identification, but doggedly it stayed in the game, and is today dominant in both video and audio watermarking, something used throughout digital film distribution, as well as video fingerprinting. The difference is that a watermark is something you put on a film for identification later, and fingerprinting is a way of identifying a piece of video from inspecting just 4 or 5 seconds of the actual file. Given that most of the world’s social networking and user generated content web sites are all trying to reliably identify both music and…