This should be fairly simple. I want to use Sharepoint Workspaces to share documents. Most clients will be using a secured network to connect. I'm not worried about them. I am worried about other clients (contractors, vendors, etc) that are not on a secured network. I would like to lump everyone who isn't using a secured network into a group, and somehow prevent them from downloading the documents onto their computers, in case something happens.
Is there any way to prevent certain users from having a local copy of a file on their machine, yet still edit the documents in-browser only?