Title is pretty self-explanatory. Here is an excerpt from the online docs. I think it's also curious that the links are greyed out, almost like placeholders, is there something overtly secret about this stuff getting left out of docs AND Samples?? I mean there is no sample for rendering extension, this is really poor.
- Microsoft.ReportingServices.ReportRendering
Contains classes and interfaces that enable you to extending the rendering capabilities of Reporting Services. Using the members of this namespace along with members of the Microsoft.ReportingServices.Interfaces namespace, you can build your own, custom rendering extensions for Reporting Services.
So who is the magic gatekeeper? Where can I find this stuff?