Editor's Note: After deadline, the hearing in this case was moved from Thursday, May 3 to August 16. The story has been updated to reflect the change.

The highly publicized debate over whether a federal court could compel Apple to break the security features of the iPhone at the behest of the FBI was a rare moment in history. Most of the time, the public never has a clue when authorities come knocking to ask a company for help in accessing the digital communications of a criminal suspect.

But in August, we may learn more about whether the curtain of secrecy around past electronic surveillance in criminal investigations will be pulled back.

U.S. Magistrate Judge Kandis Westmore of the Northern District of California will hear from local prosecutors and two legal activists, Jennifer Granick of the American Civil Liberties Union and Riana Pfefferkorn of the Stanford Center for Internet and Society, over whether she should set up a process to determine which cases are still validly sealed and those that can be opened.

Granick and Pfefferkorn petitioned the court to unseal cases in the Northern District—where Apple, Google and other giants of Silicon Valley are headquartered—in which technical assistance was sought by authorities, from 2006 until the 6 months prior to the court making a decision. Doing so would surely be a massive administrative undertaking. But the two argue that even if it's hard to do, that doesn't overcome the public's right to know under the law.

“An unintentional by-product of local court practices and federal surveillance statutes is that the surveillance dockets of federal courts around the country typically remain under seal indefinitely, long past any need for secrecy,” Pfefferkorn said this week in an email. “That situation, while inadvertent, contravenes the press and public's rights to access the courts. Our petition aims to correct that,” she added.

Westmore initially denied a motion to unseal surveillance dockets from 2006-2011 in an order last year, calling it overbroad, while at the same time directing prosecutors to evaluate what could be unsealed. The U.S. Attorney's Office indicated that while some prior case files could be unsealed, it was currently only willing do to do so on a case-by-base basis. Granick and Pfefferkorn say that's not a workable solution.

The challenge that they now face now involves a case out of the D.C. district court called In re Leopold, in which a BuzzFeed journalist named Jason Leopold sought to unseal almost 20 years' worth of cases involving digital communications surveillance.

Leopold and the Reporters Committee for Freedom of the Press were able to get a fair amount of data through that lawsuit. But in February, the chief judge of the D.C. district court ruled that giving them everything they asked for would put an “unduly significant” burden on prosecutors and the clerk's office.

“We understand that our request presents a challenge, but we disagree with the Leopold court that the challenges of unsealing are dispositive,” Granick and Pfefferkorn write in their latest brief. They argue that Ninth Circuit law is different than in D.C., and that the Leopold case is distinguishable from their own in terms of the work it would require. At the same time, they say they're open to narrowing their petition to make it feasible.

The local U.S. attorney's office is not exactly enthusiastic about the idea of unlocking years' worth of sealed dockets. It says the office—in cooperation with the court clerk—has already made some prospective changes to make it easier to track and unseal cases in the future.

“The litigation in Leopold teaches that unsealing or docketing of historical matters is an unduly burdensome process,” Assistant U.S. Attorney Kyle Waldinger wrote in a response brief.

Westmore is set to hold a case management conference to hear from both sides—and possibly give her own views—at her courtroom in Oakland on August 16.

Correction: An earlier version of this story misstated the length of time that the petition covers, and inadvertently mischaracterized the judge's decision last year. She denied a motion to unseal, not the petition.