GuardedID was part of Comcast's Constant Protection Suite.
Im not sure it is still used because if you go to the website it has Norton all over it. One thing I see is that Identity Guard is being used.
At some point GuardedID's keystroke encryption was still being installed along Norton's features.
I don't have an Xfinity account but anyone that does gets Constant guard with their subscription, someone here that has comcast/xfintiy can call and verify if Guardedid keystroke encryption is still being used and report back to us