CRM 2011 jQuery from external site - permissions?

So I came across this post about accessing CRM data from an external application. How do we handle permissions? In my case, an external web site will be pushing 开发者_C百科& pulling data from CRM 2011 in the cloud. How will permissions be handled? How do I set permissions when making a call? Every piece of documentation I've seen shows examples of jQuery, but running within CRM, rather than externally.

I'm not quite sure, but according to the SDK you cannot use the REST-endpoint outside of the CRM.

The article about Use the REST Endpoint for Web Resources states following limitation

Authentication is only possible within the application Use of the REST endpoint is limited to JScript libraries or SilverlightWeb resources.

This explains why all examples only show the internal usage.