Why is Symantec scanning my website for vulnerabilities?
Symantec offers an opt-in service called Norton Trust Services that provides a vulnerability assessment service for websites. The websites in question that have opted in are given the option to add a Norton Secured Seal to their website showing they are a part of this service.
Additional details can be found in the Connect article Why am I getting IDS alerts on vulnerability scans from Symantec?
Imported Document Id