GREENBELT, Md. (AP) — A man who spent years fighting his extradition from Ireland to the U.S. pleaded guilty Thursday in a Maryland courtroom to operating a web hosting service that allowed users to anonymously access more than 1 million files of child pornography.

Eric Eoin Marques, 34, faces a mandatory minimum of 15 years in prison and a maximum of 30 years after his guilty plea to one count of conspiracy to advertise child pornography. A plea agreement will ask U.S. District Judge Theodore Chuang to sentence Marques to 15 to 21 years in prison, but the judge is not bound by the recommendation.

Marques can withdraw his guilty plea if the judge departs from that recommended range. U.S. District Judge Theodore Chuang is scheduled to sentence Marques on May 11.

Marques operated a web hosting service on the darknet that allowed thousands of users to view and share child pornography, including hundreds of thousands of images and videos depicting the rape and torture of infants and older children, according to a court filing Thursday.

Marques, a dual citizen of the U.S. and Ireland, has remained in custody since his August 2013 arrest in Dublin after an extradition request from the U.S. He was living in Ireland at the time of the alleged offenses. The server that he allegedly used was in France.

Marques was extradited from Ireland to Maryland last year. The plea agreement doesn’t give him credit for the nearly six years he spent in custody in Ireland.

The darknet is part of the internet but hosted within an encrypted network. It is accessible only through anonymity-providing tools, such as the Tor browser.

Marques created and operated a free, anonymous web hosting service, called “Freedom Hosting,” on a network allowing users to access websites without revealing their IP addresses. In 2013, FBI agents in Maryland connected to the network and accessed a child pornography bulletin board with more than 7,700 members and more than 22,000 posts. Agents downloaded more than 1 million files from another website on the network, nearly all of which depicted sexually explicit images of children.

“Did you do the things the government said you did?” the judge asked Marques after a prosecutor read aloud a summary of the case against him.

“Yes,” Marques said.

Authorities seized nearly $155,000 in U.S. currency from Marques, who said during an August 2013 extradition hearing that his business had been “very successful” and profitable, according to Thursday’s court filing.

In a Dec. 19 court filing, Marques’ defense attorneys said “perhaps the greatest overarching question” about the case is how federal investigators were able to pierce the Tor network’s “veil of anonymity” and trace the IP address of the server to a web hosting company in Roubaix, France. “This anonymity is notoriously difficult for government investigators to penetrate,” they wrote.

Defense attorneys said they received an initial answer to that question earlier in December, when the government revealed “vague details” of how they discovered the IP address and location of the server.

“It appears that this disclosure was delayed, in part, because the investigative techniques employed were, until recently, classified,” defense lawyers wrote.

One of Marques’ attorneys, Brendan Hurson of the Office of the Federal Public Defender, said after Thursday’s hearing that he could not elaborate on the government’s disclosure.

Marques was indicted in April 2019 in Greenbelt, Maryland, on four counts: conspiring to advertise child pornography, conspiring to distribute child pornography, advertising child pornography and distribution of child pornography.

During a 2013 bail hearing for Marques in Dublin, FBI Special Agent Brooke Donahue described him as “the largest facilitator of child porn on the planet,” according to Irish broadcaster RTE. Donahue also testified that Marques had been searching online for information about obtaining a Russian visa and citizenship, RTE reported.

“He was trying to look for a place to reside to make it most difficult to be extradited to the United States,” the FBI agent said.

Irish authorities didn’t charge him with any related crimes while he fought his extradition.

“That decision was made notwithstanding that (Marques) had offered to plead guilty to at least some of the potential charges that might have been brought against him in Ireland,” a justice on the Supreme Court of Ireland wrote in a March 2019 judgment rejecting his final appeal.

Hurson said Marques has “zero ties” to the U.S. and hopes to leave the country as soon as he completes his sentence.