As well as keeping her silent, it committed Weinstein to attend therapy and required the company to act if he made any more payouts over alleged wrongdoing.
Perkins told AP: "I have no idea if any of the obligations were upheld."
Perkins is due to give evidence before MPs investigating workplace sexual harassment.
Non-disclosure agreements (NDAs) are common in the corporate world, but Perkins said her experience showed they can be used to let perpetrators get away with wrongdoing while silencing their victims.
The agreement Perkins signed kept her quiet about Weinstein's behaviour for almost 20 years.
He continued to be one of Hollywood's most powerful producers until last year, when women - including Hollywood stars - publicly accused him of groping, exposing himself to them or forcing them into unwanted sex.
Weinstein has since been fired by the company he co-founded and expelled by Hollywood's film academy.
Police in the US and Britain are investigating multiple claims of sexual assault. Weinstein denies all allegations of non-consensual sex.
- PA, AAP
