Is it allowed and supported to user "RenderPDFForm", if just "Process Management ES" is licensed?
On the one hand you need it to render a form for workspace, on the other hand it is part of the category "Forms".
As far as I understand there is a Default Render service in Process Management category that is used to render form in Workspace.
So I think the answer is no. RenderPDFForm is for use with Forms.
Also you can see in Adobe document http://help.adobe.com/en_US/livecycle/es/overview.pdf that there is no Forms services included with Process Management.