Los Angeles Superior Court Judge David Yaffe let stay a restraining order issued last month that forbids Farrell's ex, Nicole Narain, from selling, distributing or displaying the 2-year-old tape – which the Alexander star, 29, says in his lawsuit against her was never meant to be made public.
Farrell's suit alleges that the former Miss January, 31, was working with the owner of an X-rated Internet business and contacting the news media about the tape.
Farrell's legal action said the release of the tape would irreparably harm him and his career.
"We're pleased with the result" of Wednesday's ruling, Farrell's attorney, Martin Singer, tells New York's Daily News. "My client's privacy rights should be preserved."