From a Times article featuring The Guardian’s editor testifying before a British Parliament committee:
Since the revelations, newspapers, particularly those that have dealt with Mr. Snowden’s material, have also had to adjust to a harsh new reporting environment, security experts and journalists said, as governments and others seek secret material held by reporters.
“The old model was kind of like your house,” said Marc Frons, the chief information officer of The New York Times. “You locked your front door and windows, but not your desk drawer, even if it had your passport inside. In the new model, you have locks on everything.”
The Guardian, The Washington Post and The Wall Street Journal declined to comment about internal security arrangements.
But Mr. Rusbridger told Parliament that the newspaper “went to more precautions over this material than any other story we have ever handled.”