Hello,
Find Unmanaged Computers features have been integrated in Client Deployment Wizard in SEP 12.1
You can find unprotect system use Unmanaged Detector
Unmanaged Detector in SEP 12.1
https://www-secure.symantec.com/connect/articles/unmanaged-detector-sep-121
What does it mean to set a client as an Unmanaged Detector?
Read Chetan and Mithun Comments
https://www-secure.symantec.com/connect/forums/121-unamanage-tab#comment-8360001