Polanski claims he fled in 1978 on the eve of sentencing because he didn't think he was getting a fair deal,
In 2010, Gunson testified behind closed doors that the court had broken a promise to release Polanski,
According to Gunson, "the judge had promised him on two occasions...something he broke." The author said, "So it was not unexpected for me
A California appeals court on Wednesday approved the release of the transcript, after dropping long-standing objections.
Braun has tried, without success in the past, to settle what judges and prosecutors believe Polanski to be.
Over four decades of a life marked by sorrow and achievement, the legal tale has played on both sides of the Atlantic as a recurring scene.
Polanski escaped from the Krakow ghetto as a young child during the Holocaust. His wife, Sharon Tate, was one of seven people killed by followers of Charles Manson in 1969.
In anticipation of the transcript's release, defence attorney Harland Braun stated on Friday that the revelation will redouble his efforts to have Polanski sentenced.