I think it must be from Microsoft. I googled it and Microsoft talked about a SMS (Software Management Systems) but I didn't find Sofrtware Distribution Service 2.0 (SDS).
But I find in in System Resotre--it apparently automatically runs System Restore from time to time...in addition to another arrangement that runs a system Restore from time to time...can't remember what that is called art the moment.
Is there a site or a MS article that discusses SDS. And what is SDS anyway?