There is a TED talk Margaret Gould Stewart: How YouTube thinks about copyright which describes, in a general, way the state of technology. YouTube/Google is able to review an incredible amount of data in order to determine if the information is copyrighted - and if it is what to do about it.
If you're concerned about privacy use this video as a stepping to stone to comprehend the future. Computer processing speed is doubling every 18 months. In less than twenty years processing power will be 1000 times greater than it is today. What currently takes Google, YouTube, the NSA one year will take about 8.5 hours. Or, put in another way, what now takes 24 hours will take a little under 3 minutes.