By opening up the code, Sun aims to regain some of the ground it lost to Linux over the past years. To further increase the appeal of Solaris over Linux, the company promised to apply an arsenal of 1,670 patents to protect developers and users against patent infringement claims.More details at VNU Net
Sun to make Solaris 10 opensource

Sun decided to make its Solaris 10 operating system opensource. The company plans to make the source code available in the second quarter of this year.