Bill Cosby's lawyers are challenging the legality of the process under which a Pennsylvania board recommended he be classified as a sexually violent predator.
They also claimed in a court filing last week that the state's recently revised sex offender registry law is unconstitutional and should not be applied retroactively.
The 81-year-old Cosby is due to be sentenced September 24 on three counts of aggravated indecent assault.
He was convicted in April of drugging and molesting a woman at his suburban Philadelphia mansion 14 years ago.
He plans to appeal.
A judge must decide whether to accept the finding he is a predator.
The designation would require the former TV star to receive sex offender counseling by a state-approved provider at least monthly for the rest of his life.