The attached pdf refers to a configuration where Lightstreamer works together to a Web/Application server; in that scenario the actual authentication is handled by the legacy Web/Application server, irrespective of Lightstreamer.

In order to better assist you, we need to understand if you are working with Lightstreamer together a Web/Application server or with Lightstreamer alone.
Maybe you are just developing and you do not want introduce, for the moment, a Web/Application server?