I don't know if licensing information is available other than reaching out to Laserfiche (since it appears you're a VAR).

The official product name of these licenses are

Keyed Concurrent ReadOnly User

Keyed Concurrent Full User

In your case, you would need the Full User version to write documents.

Using them is quite simple, all you need to do is provide an ApplicationID and ApplicationName when creating the session object.

For example,

var session = new Session
{
    ApplicationId = ApplicationId,
    ApplicationName = ApplicationName,
    AutoReconnect = true,
    CanShareLicense = true
};
                
session.LogIn(User, Password, registration);
session.KeepAlive = true;

Once you have the licenses, there is an "Application Key" tab on the main page of LFDS that can be used to access the Id/Key value.

The Name can be anything you want and will be displayed in the active sessions portion of the administration console.