readme updated on the use of the config file

README.md

@@ -96,13 +96,18 @@ Server Configuration
 ====================
 
 The server is controlled by a yaml configuration file (e.g. "config.yaml").  
-This file normally resides in the bin directory but the path to this configuration file can be changed using the environment variable READIUM_LICENSE_CONFIG.
+The License Server and License Status Server will search their configuration file in the bin directory by default;
+but the path to this file can be changed using the environment variable READIUM_LICENSE_CONFIG.
+The License Server and License Status Server may share the same configuration file (if they are both executed on the same server)
+or they can have their own configucation file. In the first case, the htpasswd file and database may also be shared.
+In the latter case, the License Server will have a "lcp" section and a "lsd_notify_auth" section; the License Status Server will
+have a "lsd" section.     
 
 "certificate":	parameters related to the signature of the licenses	
 - "cert": the provider certificate file (.pem or .crt). It will be inserted in the licenses and used by clients for checking the signature.
 - "private_key": the private key (.pem). It will be used for signing  licenses.
 
-"lcp" (License Server) & "lsd" (License Status Server) have an identical structure:
+"lcp" (License Server) & "lsd" (License Status Server) sections have an identical structure:
 - "host": the public server hostname, `hostname` by default
 - "port": the listening port, `8989` by default
 - "public_base_url": the public base URL, combination of the host and port values on http by default 
@@ -124,7 +129,7 @@ of a license generation. The notification endpoint is configured in the "lsd" se
 - "filesystem": parameters related to a file system storage
   - "directory": absolute path to the directory in which the protected publications are stored.
 
-"license": parameters related to static information to be included in all licenses
+"license": parameters related to static information to be included in all licenses generated by the License Server
 - "links": links that will be included in all licenses. "hint" and "publication" links are required in a Readium LCP license.
   If no such link exists in the partial license passed from the frontend when a new license his requested, 
   these link values will be inserted in the partial license.