It remains to be seen if The Lords of Dharmaraja will release any actual files and what version of Norton AntiVirus, if any, will be affected. If it's current enough, the code could potentially provide malware writers with the knowledge required to evade detection, and could give Symantec's competitors an inside look into the company's technology.
If the leak turns out to be real, Symantec wouldn't be the first antivirus vendor to deal with such an incident. In January 2011, the source code for an older version of Kaspersky Antivirus was uploaded to a torrent site. The intellectual property was stolen in early 2008 by a former Kaspersky employee who attempted to sell it on the Internet. He received a three-year suspended prison sentence in Russia.