Ask HN: Is there private iPaper-like tool?

Can anyone help me find a tool that allows me to embed a document viewer, iPaper-like, in our web site? Scribd's iPaper is awesome, but is designed for data sharing. I want to display private documents in the web browser and only for user who are logged into my web site. And for legal reasons, the documents must always be stored on our servers, not on a third-party service.