Deleting a dictionary can't be undone. Dictionaries that are used by DLP policies cannot be deleted. First, delete the policy, then delete the Dictionary.
To delete a Policy Dictionary:
- Go to Policy > DLP Policies > Dictionaries.
- Under Policy Dictionaries, select the target dictionary. The pane on the far right displays any DLP policies that use the dictionary.
- Under Policy Dictionaries, click the X to the right of the dictionary you want to delete.
- In the Delete Confirmation dialog, click OK.