Court papers unsealed this week reveal that the Motion Picture Association of America (MPAA) has filed a motion for a summary judgement.
If approved, the move could lead to action against the service without the need for a lengthy trial.
Hotfile says it removes copyright-infringing files on request.
It marks the latest step in the film studios’ year-long legal effort to have Hotfile shut down.
The court papers name Disney, 20th Century Fox, Universal Studios, Columbia Pictures and Warner Bros as the plaintiffs.
They claim that “Hotfile actively fosters the massive copyright infringement that fuels its business”, adding that “more than 90% of the files downloaded from Hotfile are copyright infringing, and nearly every Hotfile user is engaged in copyright infringement”.
The studios claim that Hotfile’s business model is “indistinguishable” from that of Megaupload and draw attention to its affiliate programme.
This offered users payments based on how many times their files had been downloaded. The studios claim this encouraged “the uploading of ‘popular’ (ie infringing) content”.
BBC, Mar 8 2012