Resource demonstrating access permissions
If you are a public visitor, you will see a link to a file you can download.
If you are logged in as a member, you will see a link to another file which only members can download. This file is not even visible to non-members.
Whatever your status, you will also see a link to Add this resource to your Cart. After payment you will be able to download it.
Of course we are unlikely to use all three for one resource, but you can use one or more as required. You can also attach more than one file of each kind.