Adding a Security Policy
To create a new security policy, in the top right corner under your avatar, click the Gears icon, and then click Security Policies.
In the Security Policy screen in the top right corner, click Add Policy. In the Add Policy pop-up window, type the policy specifications you want, and then click Save.
For example: If you have a PDF file with the title “Top Secret,” you can type that phrase in the Body Contains textbox. This prevents any PDF file with this title from being shared or updated.