This is a copy of the 525 page "executive summary" of the U.S. Senate Select Committee on Intelligence's 6007 page report on the U.S. Central Intelligence Agency (CIA) use of torture as part of its "detention and interrogation program." The report, nicknamed "the study," was a result of more than 5 years of investigations that drew upon more than 6 million pages of documents.
These 525 redacted pages were declassified and first released to the public on December 9, 2014 here:
http://www.intelligence.senate.gov/study2014/sscistudy1.pdf
Code words used in the report have been deciphered here:
http://cryptome.org/2014/12/cia-torture-nyms.htm