The RWS Tridion Docs(Version SDL Tridion Docs - Content Manager - Build 14.0.4101.2) documentation in the link below states the use of this API, but there is no sample code available to implement the API to fetch topics from the Docs CMS:
https://docs.rws.com/992513/128791/tridion-docs-14-sp4/documentobj-2-5-getobject
So far I have tried the below code, but I am getting encrypted version of the content, as shown below:

            var docClient = new DocumentObjServiceReference.DocumentObjClient(ishWSBinding, new EndpointAddress(docObj25Uri));
            var request = new DocumentObjServiceReference.GetObjectRequest("GUID-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx", "3", "en-US", "", "", "");
            
            //Create a channel from the client and inject the token.
            var docObj25Channel = docClient.ChannelFactory.CreateChannelWithIssuedToken(token);
            var xmlDocumentObjectList = docObj25Channel.GetObject(request);

            Console.WriteLine("Version: " + xmlDocumentObjectList.version + "\n");
            Console.WriteLine(xmlDocumentObjectList.xmlObjectList);

<?xml version="1.0" encoding="UTF-16"?>

-<ishobjects>


-<ishobject revisionid="GUID-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" ishlngref="42781" ishversionref="42780" ishlogicalref="41203" ishtype="ISHModule" ishref="GUID-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx">


-<ishdata fileextension="xml" mimetype="text/xml" edt="EDTXML">

-<![CDATA[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]]>
</ishdata>

</ishobject>

</ishobjects>

Is there a way to fetch the content of the topics as is?