Sure, that's possible of course, but that doesn't really change the status quo. The government has always had far more ability to create fake content than individuals. However, this type of system would allow individuals to prove veracity of their content, which is where the real value comes in my opinion. If you have a professional photographer then they can prove that their camera took a particular picture. If you trust that photographer then you can know that a picture came from that individual. I think that's going to be the dynamic going forward. People will decide on what sources they trust, and the technology will provide a way to tell what the source for the media is.