A couple of key paragraphs:

"Now, NCTC [National Counterterrorism Center] can copy entire government databases—flight records, casino-employee lists, the names of Americans hosting foreign-exchange students and many others. The agency has new authority to keep data about innocent U.S. citizens for up to five years, and to analyze it for suspicious patterns of behavior. Previously, both were prohibited. Data about Americans 'reasonably believed to constitute terrorism information' may be permanently retained.

"The changes also allow databases of U.S. civilian information to be given to foreign governments for analysis of their own. In effect, U.S. and foreign governments would be using the information to look for clues that people might commit future crimes."