"On April 3, 2014, the Senate Select Committee on Intelligence voted to send the Findings and Conclusions and the Executive Summary of its final Study on the CIA's Detention and Interrogation Program to the President for declassification and subsequent public release"...
EDIT: also the fact that it's stamped "Unclassified" everywhere. If it was stamped as still classified and had been leaked, anyone with a clearance would risk losing it by reading the file.
"On April 3, 2014, the Senate Select Committee on Intelligence voted to send the Findings and Conclusions and the Executive Summary of its final Study on the CIA's Detention and Interrogation Program to the President for declassification and subsequent public release"...
EDIT: also the fact that it's stamped "Unclassified" everywhere. If it was stamped as still classified and had been leaked, anyone with a clearance would risk losing it by reading the file.