SEOUL?Foreign pornographers accused South Korean prosecutors of discrimination and vowed to step up their legal battle against copyright pirates, their lawyer said Friday.

In an unusual case, a Seoul law firm representing 50 US and Japanese porn producers filed a complaint in July against 10,000 local Internet users who pirate the foreign content for profit.

Prosecutors charged just 10 habitual offenders with breach of copyright, an offense that is punishable by jail in South Korea.

The disgruntled foreign pornographers believe prosecutors have been too lenient with offenders, lawyer Kim Han-Seo told Agence France-Presse.

Some local Internet users allegedly earned up to 30 million won ($24,170) a month from other users who clicked on the pirated content.

"Now, we've drawn up a new list of some 65,000 users who fit this guideline," the lawyer said.

"We'll see whether the prosecutors will press charges against them all."

Kim noted that judicial authorities last week acted swiftly to stamp out the piracy of South Korean blockbuster disaster film "Haeundae," mounting a raid on 24 website operators.

"They [prosecutors] are discriminating against foreign producers by applying different standards in protecting foreign-made videos," he said.

"My clients say they may appeal for help from the US government if necessary."