Intelligence agencies already have full access to ISPs in those countries participating in the Echelon electronic spying network (Australia, Canada, the UK and the USA), and these latest measures are intended to extend similar powers to a wide range of other agencies.
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the Federal Communications Commission issued a final Order effective Monday November 14th compelling all broadband Internet service providers and many Voice over Internet Protocol, or VoIP, companies to include backdoors allowing police and many other enforcement agencies to directly eavesdrop on their customers by April 2007.
They already have access. Due to the "Patriot Act", in the US you don't have to be suspected of anything other than curiosity.
FYI: Computers have a unique id that can be saved with files. It's a "watermark" that shows what computer created the file. The sad part about this is that if I knew I was going to do something illegal, the solution is easy:
Use a notebook paid for with cash and connect over someone elses unprotected wireless line. Unless they roll up on you while you're doing it, you're 100% safe. Plus you just left digital fingerprints of someone else that will throw the Feds off your track.