All of our network players are able to access the standard, unprotected UPnP folders served by a UPnP server as standard. Some UPnP media servers and/or NAS drives also allow access to the content in protected folders.
Unfortunately, there is no way for our network players to access simple (or protected) network shared folders unless they are made available by a UPnP server.
Most NAS drives which have protected folders also have unprotected folders, which is the part that the UPnP server usually broadcasts.
Anything that you don’t want served (personal documents, etc) can be kept in the protected drive and will not be shared on the network. Music/photos should be stored in an 'Open' folder to allow them to be seen by network players or media browsers.