...[N]ews organizations are trying to outwit a new generation of prosecutors and protect reporters and sources in what they believe to be an increasingly antagonistic environment. In some instances, news executives are issuing guidelines to educate and retrain their staffs about taking precautions to protect their notes and other source materials from being sought as evidence in legal cases. Some are also looking at technological fixes like heightened encryption and e-mail messages that expire after a period of time.... Several news organizations had already begun clamping down on the use of anonymous sources and tightening the rules for when they...