I never seen this option as we are using since long time. The rule is if user X set any TAG to file so he can Un-Tag this file but others no one .
In my environment other DLP agent user is able to un-tag the document , I want to prevent this from happening
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Check in Tag the disable option manual tagging allowed . Other way add only those user group in the protection which you want to allow tagging. then create another tag with the same rule with untag manual tagging option then create protection rule similar like old one and add block user group.
I hope it will worked