diff --git a/npbackup/__main__.py b/npbackup/__main__.py
index 8669217..0d57a18 100644
--- a/npbackup/__main__.py
+++ b/npbackup/__main__.py
@@ -243,9 +243,10 @@ This is free software, and you are welcome to redistribute it under certain cond
 
     args = parser.parse_args()
 
-    version_string = "{} v{} {} - {}".format(
+    version_string = "{} v{}-{} {} - {}".format(
         __intname__,
         __version__,
+        "PRIV" if configuration.IS_PRIV_BUILD else "PUB",
         __build__,
         "GUI disabled" if _NO_GUI else "GUI enabled",
     )
diff --git a/npbackup/configuration.py b/npbackup/configuration.py
index ad70c25..390cda4 100644
--- a/npbackup/configuration.py
+++ b/npbackup/configuration.py
@@ -25,11 +25,12 @@ from npbackup.customization import ID_STRING
 try:
     from npbackup._private_secret_keys import AES_KEY, DEFAULT_BACKUP_ADMIN_PASSWORD
     from npbackup._private_revac import revac
-
     AES_KEY = revac(AES_KEY)
+    IS_PRIV_BUILD = True
 except ImportError:
     try:
         from npbackup.secret_keys import AES_KEY, DEFAULT_BACKUP_ADMIN_PASSWORD
+        IS_PRIV_BUILD = False
     except ImportError:
         print("No secret_keys file. Please read documentation.")
         sys.exit(1)
@@ -270,3 +271,7 @@ def save_config(config_file: str, config_dict: dict) -> bool:
     except OSError:
         logger.critical("Cannot save configuartion file to %s", config_file)
         return False
+
+
+def is_priv_build() -> bool:
+    return IS_PRIV_BUILD
\ No newline at end of file