Despite denying involvement, North Korea did describe the hacking and later leaking of massive amounts of data from the entertainment company as a "righteous deed."
A message from the group calling itself the Guardians of Peace has demanded that the film be dropped. "Stop immediately showing the movie of terrorism which can break the regional peace and cause the War," the demand reads. The group also denied that it sent e-mails to Sony Pictures employees last week threatening them and their families.
There are several reasons why security experts are looking Pyongyang as a possible source of the attack, which you can read about here.
Far from being put off by the North Korean link, Rogen and Franco have found the North Korean outrage and link to the attack amusing, appearing on Saturday Night Live to joke about it.
Sources and Recommended Reading:
Hackers demand Sony cancel release of Kim Jong-un-baiting comedy: www.theguardian.com