diff --git a/pywidevine/cdm.py b/pywidevine/cdm.py
index a6257e5..40cae91 100644
--- a/pywidevine/cdm.py
+++ b/pywidevine/cdm.py
@@ -222,7 +222,7 @@ class Cdm:
             new(self.device.private_key). \
             decrypt(license_message.session_key)
 
-        enc_key, mac_key_server, mac_key_client = self.derive_keys(*context, session_key)
+        enc_key, mac_key_server, _ = self.derive_keys(*context, session_key)
 
         license_signature = HMAC. \
             new(mac_key_server, digestmod=SHA256). \
diff --git a/pywidevine/main.py b/pywidevine/main.py
index a2b63a2..e7eeeb4 100644
--- a/pywidevine/main.py
+++ b/pywidevine/main.py
@@ -235,7 +235,7 @@ def create_device(
         file_hashes_.ParseFromString(device.client_id.vmp_data)
         log.info(f" + VMP: True ({len(file_hashes_.signatures)} signatures)")
     else:
-        log.info(f" + VMP: False")
+        log.info(" + VMP: False")
     log.info(f" + Saved to: {out_path.absolute()}")