diff --git a/docs/searxng_extra/standalone_searx.py.rst b/docs/searxng_extra/standalone_searx.py.rst
index 1d2d698a..7cbbccfd 100644
--- a/docs/searxng_extra/standalone_searx.py.rst
+++ b/docs/searxng_extra/standalone_searx.py.rst
@@ -1,9 +1,9 @@
 
 .. _standalone_searx.py:
 
-===================================
+=====================================
 ``searxng_extra/standalone_searx.py``
-===================================
+=====================================
 
 .. automodule:: searxng_extra.standalone_searx
   :members:
diff --git a/searxng_extra/google_search.py b/searxng_extra/google_search.py
index cad32eec..34b40c0f 100644
--- a/searxng_extra/google_search.py
+++ b/searxng_extra/google_search.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 from sys import argv, exit
 
 if not len(argv) > 1:
diff --git a/searxng_extra/standalone_searx.py b/searxng_extra/standalone_searx.py
index ae18d7c0..e243d9cb 100755
--- a/searxng_extra/standalone_searx.py
+++ b/searxng_extra/standalone_searx.py
@@ -1,5 +1,11 @@
 #!/usr/bin/env python
-"""Script to run searx from terminal.
+# lint: pylint
+
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# (C) Copyright Contributors to the SearXNG project.
+# (C) Copyright Contributors to the searx project (2014 - 2021)
+
+"""Script to run SearXNG from terminal.
 
 Getting categories without initiate the engine will only return `['general']`
 
@@ -56,25 +62,8 @@ Example to run it from python:
     },
     "suggestions": [...]
 }
-"""  # noqa: E501
-# pylint: disable=pointless-string-statement
-'''
-searx is free software: you can redistribute it and/or modify
-it under the terms of the GNU Affero General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-searx is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU Affero General Public License for more details.
-
-You should have received a copy of the GNU Affero General Public License
-along with searx. If not, see < http://www.gnu.org/licenses/ >.
-
-(C) 2016- by Alexandre Flament, <alex@al-f.net>
-'''
-# pylint: disable=wrong-import-position
+""" # pylint: disable=line-too-long
+
 import argparse
 import sys
 from datetime import datetime
diff --git a/searxng_extra/update/update_ahmia_blacklist.py b/searxng_extra/update/update_ahmia_blacklist.py
index f645880e..f7695dea 100755
--- a/searxng_extra/update/update_ahmia_blacklist.py
+++ b/searxng_extra/update/update_ahmia_blacklist.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
 
 # This script saves Ahmia's blacklist for onion sites.
 # More info in https://ahmia.fi/blacklist/
diff --git a/searxng_extra/update/update_currencies.py b/searxng_extra/update/update_currencies.py
index 06380164..93ac15aa 100755
--- a/searxng_extra/update/update_currencies.py
+++ b/searxng_extra/update/update_currencies.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
 
 import re
 import unicodedata
diff --git a/searxng_extra/update/update_engine_descriptions.py b/searxng_extra/update/update_engine_descriptions.py
index 57646f07..59a9a72a 100755
--- a/searxng_extra/update/update_engine_descriptions.py
+++ b/searxng_extra/update/update_engine_descriptions.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
 
 import json
 from urllib.parse import urlparse
diff --git a/searxng_extra/update/update_external_bangs.py b/searxng_extra/update/update_external_bangs.py
index e6331d47..27882bb2 100755
--- a/searxng_extra/update/update_external_bangs.py
+++ b/searxng_extra/update/update_external_bangs.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # lint: pylint
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """
 Update searx/data/external_bangs.json using the duckduckgo bangs.
 
diff --git a/searxng_extra/update/update_firefox_version.py b/searxng_extra/update/update_firefox_version.py
index 6acfe76c..6a446947 100755
--- a/searxng_extra/update/update_firefox_version.py
+++ b/searxng_extra/update/update_firefox_version.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
 
 import json
 import requests
@@ -16,7 +17,7 @@ NORMAL_REGEX = re.compile('^[0-9]+\.[0-9](\.[0-9])?$')
 # BETA_REGEX = re.compile('.*[0-9]b([0-9\-a-z]+)$')
 # ESR_REGEX = re.compile('^[0-9]+\.[0-9](\.[0-9])?esr$')
 
-# 
+#
 useragents = {
     "versions": (),
     "os": ('Windows NT 10.0; WOW64',
diff --git a/searxng_extra/update/update_languages.py b/searxng_extra/update/update_languages.py
index 3f8a989e..e05dced6 100755
--- a/searxng_extra/update/update_languages.py
+++ b/searxng_extra/update/update_languages.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
 
 # This script generates languages.py from intersecting each engine's supported languages.
 #
diff --git a/searxng_extra/update/update_osm_keys_tags.py b/searxng_extra/update/update_osm_keys_tags.py
index be76dc40..77c715ba 100755
--- a/searxng_extra/update/update_osm_keys_tags.py
+++ b/searxng_extra/update/update_osm_keys_tags.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # lint: pylint
-# pylint: disable=missing-function-docstring
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Fetch OSM keys and tags.
 
 To get the i18n names, the scripts uses `Wikidata Query Service`_ instead of for
diff --git a/searxng_extra/update/update_pygments.py b/searxng_extra/update/update_pygments.py
index a7a238be..3b1c525a 100755
--- a/searxng_extra/update/update_pygments.py
+++ b/searxng_extra/update/update_pygments.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """
 Update pygments style
 
diff --git a/searxng_extra/update/update_wikidata_units.py b/searxng_extra/update/update_wikidata_units.py
index ddde4c13..43a872b1 100755
--- a/searxng_extra/update/update_wikidata_units.py
+++ b/searxng_extra/update/update_wikidata_units.py
@@ -1,4 +1,7 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+# pylint: disable=missing-module-docstring
 
 import json
 import collections
@@ -51,5 +54,5 @@ def get_wikidata_units_filename():
     return join(join(searx_dir, "data"), "wikidata_units.json")
 
 
-with open(get_wikidata_units_filename(), 'w') as f:
+with open(get_wikidata_units_filename(), 'w', encoding="utf8") as f:
     json.dump(get_data(), f, indent=4, ensure_ascii=False)