There are watermark settings that can be customized globally from platform configuration > security > general https://app.bigtincan.com/admin/security/general
You can change the overlay text to either email, first name + last name or a custom text
* the watermark setting is only applied to the screen view of documents. The print and email copies of the document will not have a watermark applied based on this setting and will need to be compiled on the creation.