Danny Masterson has been moved to the maximum-security prison that once housed notorious cult leader Charles Manson.

The former 'That 70s Show' actor - who was sentenced last September to 30 years to life behind bars after being found guilty of raping two women 20 years ago - was transferred from North Kern State Prison to Corcoran State Prison in California on 29 January.

Sources told Deadline the 47-year-old actor is being held at the men-only jail's highest security level unit partly for his own protection.

His online file states he will be unable to seek parole until 2042, subject to staying out of trouble.

It reads: “Parole eligible dates may also change based on a variety of other reasons, including court orders, changes in law, and routine audits."

The prison - which also previously housed Sirhan Sirhan, Robert F. Kennedy's killer - is currently over capacity with 3,700 inmates, 42 of whom are on death row, and includes a Protective Housing Unit which accommodates 47 men who require “extraordinary protection from other prisoners.”

Last week, Masterson was denied bail while he appeals his case over concerns he has "every incentive to flee".

Los Angeles Superior Court judge Charlaine F. Olmedo wrote: “If defendant’s conviction and sentence are upheld on appeal, he will likely remain in custody for decades and perhaps the rest of his life.

“In light of the fact that defendant has no wife to go home to, defendant now has every incentive to flee and little reason to return to state prison to serve out the remainder of his lengthy sentence should his appeal be unsuccessful."

The decision to deny bail comes as he has appealed against his rape conviction.

His attorneys had said last month: "Defendant requests that this Court grant bail on appeal, and offers to comply with any relevant terms and conditions imposed by the Court that enable him to be an at-home parent and financial provider for his family, including house arrest and/or participation in an electronic monitoring program administered by the probation department."

They argued that he possessed a "lack of dangerousness" and wouldn't be a flight risk, claiming they now had "extensive exculpatory evidence that was not presented to the jury".