Four UK-based hackers connected to the Lulzsec group viewed themselves as "modern day pirates", a court has heard.
Ryan Cleary, Jake Davis, Ryan Ackroyd and Mustafa al-Bassam have all pleaded guilty to hacking offences.
Cleary has also admitted to the possession of images showing child abuse, which were discovered on his hard drive.
The men are due to be sentenced at Southwark Crown Court in the coming days.
Lulzsec targeted EA, Sony Pictures and Soca in a string of 2011 attacks.
Ackroyd has admitted stealing data from Sony and attempting to redirect visitors to the Sun newspaper's website to a made-up story about Rupert Murdoch. He has pleaded guilty to carrying out an unauthorised act to impair the operation of a computer.
Cleary, Davis and Bassam all pleaded guilty to hacking and launching cyber attacks against organisations including Soca and the CIA.
Cleary also pleaded guilty to a further four charges, including hacking into the US Air Force's computers and possession of indecent images of babies and children.
Judge Deborah Taylor will sentence the men after considering mitigating factors highlighted by their lawyers.
Cleary's lawyer said his client suffered from Asperger's syndrome, which had been misdiagnosed as attention deficit disorder.
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