Using the included wswebservices.dll to access WorldServer with a custom plugin

Our developer has noticed that there is a wswebservices.dll file that Trados uses to make calls to WS. When we define plugins, we are not able to use that dll as it says it is not authorized for third party use. Being able to do so would be really helpful, is there a way to enable this? Furthermore we get the same error when trying to use the dll of the same name that is included with the WS SDK.

Our developer is David Fritch