The US software developer that claimed Green Dam-Youth Escort software infringed the copyright of their product is attempting to stop more computer manufacturers from using the software.

California-based Solid Oak sent "cease and desist" letters to other US personal computer manufacturers besides Dell and Hewlett Packard, which had already received letters on Tuesday, Jenna DiPasquale, head of Solid Oak PR and Marketing, told China Daily yesterday.

DiPasquale didn't provide the names of the computer manufacturers. Dell and HP had already received "cease and desist" letters from the company, urging them to stop distributing computers containing the alleged copied software on Tuesday.