You can set the View permissions
of the document and/or of the document library to Authenticated
only. You can check the permission from Content -> Documents and files
and click on the Actions
link of your Library and then select Set permissions
. You may also explicitly deny anonymous users to view the documents and the document library. This way anonymous users will not be able to view the documents under this library.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items