Pirate Bay founder Gottfrid Svartholm had his custody extended for four more weeks during a behind-closed-doors court hearing today. The investigation into Gottfrid's alleged hacking activities is still ongoing, with the prosecution today revealing that police records obtained during the hack may have been transferred to servers abroad.

Following a failed appeal to the Supreme Court in Sweden, Gottfrid Svartholm was extradited to Denmark last November, where he now stands accused of hacking offenses.

Denmark accuses the Pirate Bay co-founder of hacking into the mainframe computers of IT company CSC. In an earlier case in Sweden he was acquitted of similar charges, but convicted for hacking into IT company Logica.

Gottfrid appeared in court again today and during the closed-door hearing his custody was extended for a minimum of four more weeks. Until then he will remain in prison, as the authorities fear that he may compromise evidence if released.

During the hearing prosecutor Maria Cingari said that the investigation into the alleged hacking carried out by Gottfrid and his 20-year-old co-defendant is still ongoing. Since it’s such a complex case it may take “a few months” before the indictment is finalized.

“The investigation is not over. It is a very extensive and complex hacking case. Police don’t have a clear picture yet of what has happened with the stolen files. Investigations suggest that the downloaded files are partly located on servers abroad, “she said.

Among other things, Gottfrid is accused of accessing a large number of files including police records and drivers’ licenses, some of which were transferred to servers outside Denmark. The prosecution says that Danish police have asked for assistance from authorities in Australia, hoping to find out what happened to the stolen records.

Gottfrid continues to deny involvement in the Danish hacks and is pleading not guilty. According to him, someone else must have gained access to his machine to carry them out.

Gottfrid’s co-defendant, a 20-year-old Dane, also remains in prison having already been detained for more than eight months. In Denmark people can be held in custody for a year, for crimes with a punishment of up to six years.

In recent weeks Gottfrid has received a lot of support from people all over the world. More than 100,000 signed a petition to relax his restrictive imprisonment conditions.

While he now has access to his own books, access to other reading material is still very limited. Among other things, he can’t receive books or letters from outsiders.

TorrentFreak talked to Gottfrid’s mother Kristina Svartholm today, who can’t understand why her son is only allowed minimal communication with the outside world. Just last week the police stressed that she can’t give Gottfrid books and other printed material, as these may contain secret messages.

“I find it remarkable that Denmark keeps him in relative solitary confinement, after all those months between last year when he was free to contact me on a daily basis, and free to receive books, newspapers, magazines, printed copies of articles from scientific journals and so forth,” Kristina told TF.

“I think this assumption is astounding, because it suggests that I would deliberately risk my only opportunity to meet him during the single hour per week that we are allowed to see each other,” Kristina adds.

Whether the restrictive conditions will stay in place for The Pirate Bay founder will become known in the weeks to come.