The controversial software to filter pornography and other unsuitable websites may face another yet another hurdle. The developers of the Chinese filtering software ‘Green Dam’ may face legal charges from the California-based Solid Oak, makers similar filtering software.

Programming code from Solid Oak's CyberSitter has been found in the Green Dam software, according to Solid Oak

The company says that it has evidence to support copyright infringement claims against developers Jinhui Computer System Engineering Co and Dazheng Human Language Technology Co, and says it is considering seeking an injunction in a US court.

We are weighing our legal rights against the two program developers in China, said Jenna DiPasquale, the head of Solid Oak PR and marketing. We should know more in the coming 24-48 hours.

The claim put big questions on the future development of the Green Dam's for which Chinese government paid $5.85 million to develop and is to be included in all computers sold in China.

Solid Oak already sent a letter to Hewlett-Packard and Dell to stop the progress of the distribution of computers containing the controversial software.

We have sent HP and Dell, with which we have had business relationships, cease and desist letters, said DiPasquale.

We objected to the distribution of any software based on proprietary CyberSitter data, techniques, or methods that were illegally obtained or reverse engineered without proper licensing, or any Green Dam product that contains illegally obtained intellectual property, DiPasquale added.