A U.S. firm specializing in parental controls for computers may take Chinese developers of a controversial software to filter pornography to the court for copyright infringement.

The California-based Solid Oak said it had "very solid evidence" to support copyright infringement against the Jinhui Computer System Engineering Co. and Dazheng Human Language Technology Co., Chinese developers of the Green Dam software, Thursday's China Daily reported.

According to Jenna DiPasquale, the head of Solid Oak PR and marketing, programming codes within Solid Oak's Cybersitter had been found in the Green Dam software, for which the Chinese government paid 41.7 million yuan and required to be included in all computers sold on the mainland from July 1.

Solid Oak has sent "cease and desist" letters to Hewlet-Packard and Dell to stop distributing computers containing the alleged copied software and said it was considering seeking an injunction in a U.S. court.

"We are weighing our legal options against the two program developers in China. We should know more in the coming 24-48 hours," DiPasquale said.