The list of documents protected by your organization provides information about who outside the company has access to the company's documents. It does not matter where the document is located: on a supplier's or customer's PC, on an employee's laptop, etc. This list indicates whether or not the user can open the document if it is in their power.
If you see that someone inside or outside the company should not have access to certain documents, you can easily remove their permissions for the protected documents by simply changing the protection used to secure the document.
The lists of protected, accessed, etc. documents offer powerful options for filtering and free-text search by document, protection, etc. It is possible to filter by internal user, external user, corporate or user protection, etc.