A businessman turned computer hacker has been warned that he faces custody.
Gavin Paul Prince had previously denied five offences under the Computer Misuse Act.
But on Friday he changed his pleas to guilty and Judge David Hale described his actions as seeking revenge against a company.
Prince pleaded guilty to unauthorised modification to computer material by modifying email passwords and that he had unauthorised access to company data.
Gavin Prince, aged 37, of Llys Ywen, Llandudno Junction, who runs a tenant eligibility service, was rebailed pending sentence at the end of the month at Caernarfon Crown Court.
The defendant committed the offences between April 9 and April 15 last year against Colwyn Bay-based LetsXL.
Details of the prosecution case have not yet been publicly opened.
Judge Hale said that people hacked computers for various reasons.
On the face of it he had done it as an act of revenge, which was an aggravating feature.
He said that the fact that he was rebailing the defendant for a pre-sentence report should not be taken as any indication of the sentence he would receive.
All sentencing options including custody would remain open.
Prince will be sentenced on February 28.
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