suraj.sun writes to tell us that the FBI is pushing to have ISPs keep detailed records of what web sites customers have visited for up to two years. Claiming a desire to combat "child pornography and other serious crimes," the FBI and others are pressing for increased data retention, which they have been doing since as early as 2006. "If logs of Web sites visited began to be kept, they would be available only to local, state, and federal police with legal authorization such as a subpoena or search warrant. What remains unclear are the details of what the FBI is proposing. The possibilities include requiring an Internet provider to log the Internet protocol (IP) address of a Web site visited, or the domain name such as cnet.com, a host name such as news.cnet.com, or the actual URL such as http://reviews.cnet.com/Music/2001-6450_7-0.html. While the first three categories could be logged without doing deep packet inspection, the fourth category would require it. That could run up against opposition in Congress, which lambasted the concept in a series of hearings in 2008, causing the demise of a company, NebuAd, which pioneered it inside the United States."