By default documents with View Online or Download secured PDF permission will contain a watermark with the users' email-address and the date and time of opening or downloading the document. A Vault Admin can disable and enable the watermark in documents for a role.
Step 1: Select Set permissions next to the role;
Step 2: Click on the toggle to enable or disable the watermark;
Step 3: Select Save.
Read more about bulk download and watermerk setups and the setup of watermarked mass downloads.