We've added the ability for Admins to lock a Subject so that permission levels with editing capabilities cannot make edits. This is super handy if you don't want others to be able to change any of your company wide policies like your Employee Handbook. To set this up, you'll simply toggle the last option, Lock Subject, to Yes!
Note: This locks the subject for all permissions that are able to edit, including the Admin. Admins can unlock the subject to edit by going to card view > edit subject > advanced settings > unlock subject > save