According to public documents the case has additional defendants(highlighting ours):

Court Case Number: 2:11-cv-06310-ODW -SS
File Date: Monday, August 01, 2011
Plaintiff: Summit Entertainment LLC
Plaintiff Counsel: Dennis L. Wilson, David K. Caplan, Christopher T. Varas of Keats McFarland & Wilson LLP
Defendant: Daiana Santia, Hector Santia, John Does
Cause: 17:501 Copyright Infringement
Court: California Central District Court
Judge: Judge Otis D. Wright, II
Referred To: Magistrate Judge Suzanne H. Segal for discovery

Hector Santia has not currently been cited in the Summit press release as to what his suspected involvement is. In the Eclipse case, part of what initially happened was that the person to whom the Internet service was registered was initially served until it could be established specifically which person with access to that Internet service had actually done the hacking and had actual knowledge of illegal events.

Also interesting is the listing of John Doe defendants. This too happened in the Eclipse case. Initially, the online aliases of of illegal image distributors were listed along with John Does. In other words indicating that perhaps there were others who assisted in the hacking whose specific identities were not known at the time of the filing. However, when those individuals were identified months after they too were then named in the case.

The final interesting piece is that Judge Otis D. Wright, II is the same judge who presided over the Jordan Scott vs. Stephenie Meyer case. In that case, which was ended in the favor of Stephenie Meyer, Scott claimed that Stephenie Meyer had based Breaking Dawn on her novel The Nocturne.

According to The Hollywood Reporter and EW, Summit Entertainment has issued a press release identifying those who stole and leaked images from Breaking Dawn onto the Internet earlier this year. According to both sources:

“Summit’s release ID’s Daiana Santia of Argentina as having been involved in a group that stole photos, unfinished images and video of Breaking Dawn, which will be released in two parts beginning in November. Summit’s four-continent crusade involved the services of investigation firm Kroll Inc. and law firm Keats McFarland & Wilson, which located Santia and others in the northern Argentina town of Posadas. Civil actions have been filed in the U.S. and Argentina, along with a criminal action in Santia’s home country.

“While we very much appreciate the legions of committed fans of the franchise and encourage them to create community online, we cannot ignore that property was stolen,” says David Friedman, Summit’s executive vp and general counsel. “It is not fair to the majority of fans that want to see the final chapter of the Twilight Saga film franchise fully realized by the filmmaker and dedicated cast and crew to have these images out and available on the Internet.”

See THR and EW

Earlier this year the photos in question circulated the web starting with sites and Twitters in South America. The images then spread to English speaking sites and Twitters and from there the images went global.

Given that last year Summit Entertainment prosecuted the person who broke into their set photographer’s server and stole all the still images from Eclipse (six leaked online), fans shouldn’t find this latest action too surprising. In the Eclipse case Summit spent several months building a case and tracking the IP addresses attached to the leak. The trail eventually lead to Sweden where the person responsible was found and prosecuted with the full help of that country’s authorities.

Whereas a studio may occasionally turn a blind-eye to limited footage from an event like Comic Con or a pre-screening going online because that was finished product meant for public consumption, they will always go after material that is stolen from what amounts to online breaking and entering.

Other studios have taken similar measures and jail time has resulted from such cases such as the Hugh Jackman Wolverine movie.