> Which authentication mechanisms can be thought of/could be implemented to enable something like this??
You can't really do anything from in the wiki itself I think, but you can write some script or API module that is accessible from the outside and can access only the data you want to share. Not sure if you can create a real generic solution here, since MW and SMW lack a fine grained authentication model, but I'd definitely be interested in hearing ideas.
Jeroen De Dauw
Don't panic. Don't be evil.