One of my client web projects has a need to share documents with individual clients, including uploading and downloading by both the Client and Owner, all in a secure fashion. I've looked at the modules Repository and Documents, but neither provide for individual User based security.

Is there a module that will give me this granular security, or should I be looking at setting up separate pages and security roles for each client?

   It a perfect world, the Owner would go to a Client Page, upload a document specifying which user had permissions for the file, the Client could then login download the file, make changes and then upload the file again.

Any suggestions?

Thanks

Mark