From The Telegraph:
Rupert Murdoch could face criminal charges in America after he was secretly filmed telling journalists at his newspapers that bribing police officers for stories was “the culture of Fleet Street”.
US lawyers said that if the admission undermines his testimony to regulators, it could leave the News Corporation chief exposed under Title 18, Section 1001, which makes it illegal to lie to law enforcers.
...
Breaches of Section 1001 carry a penalty of up to five years in jail.
http://www.telegraph.co.uk/...
(For the record, The Telegraph is a conservative-leaning newspaper (64% of readership))
It is highly possible that his secretly filmed admission contradicts statements made to US law enforcement, since it already seems to clearly contradict what he told Parliament back in 2011 -- that he had no knowledge of the hacking until the scandal broke. If he said something similar to American investigators, he might actually get jail time.