The award-winning director of "The Pianist" and "Chinatown" has been on the run for almost 40 years but claims he reached a plea deal in the case which would keep him out of jail, attorney Harland Braun told AFP.
Braun has written to Los Angeles County Superior Court judge Scott Gordon to unseal a secret transcript of the testimony of the prosecutor in the Polanski case.
He admitted having unlawful sex with a minor, or statutory rape, as part of a plea bargain and spent 42 days in Chino State Prison before being released.
He claims Judge Laurence Rittenband reneged on his deal and told prosecutors Polanski should spend up to 50 years in prison, and the filmmaker fled to Europe.
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He spent almost a year in custody in Switzerland as authorities tried to extradite him back to the US but a Polish court ruled Polanski has served his time under the plea deal.
"After we confirm the contents, we will urge the court to recognize the Polish decision resulting from a litigation initiated by the (district attorney) and in which the DA participated," Braun said.
"If the court accepts the principle of comity, Roman can come to Los Angeles and to court without fear of custody.