diff --git a/assets/demo.py b/assets/demo.py
new file mode 100755
index 0000000..535a47e
--- /dev/null
+++ b/assets/demo.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+
+import json
+import requests
+from bs4 import BeautifulSoup
+
+URL = 'https://learn.microsoft.com/%s/windows-server/get-started/kms-client-activation-keys'
+
+
+def analyseKeys(items: list) -> dict:
+    def splitHeader(header) -> tuple[str, str]:
+        return header['id'], header.text
+
+    def splitTable(table) -> dict:
+        dat = {}
+        for item in [x for x in table.tbody if x.name == 'tr']:
+            name, key = item.select('td')
+            dat[str(name)[4:-5].replace('<br/>', '\n')] = key.text
+        return dat
+
+    result = {}
+    for index in range(len(items)):
+        if items[index].name == 'table':
+            keyContent = splitTable(items[index])
+            keyId, keyName = splitHeader(items[index - 1])
+            result[keyId] = {
+                'name': keyName,
+                'content': keyContent
+            }
+    return result
+
+
+def fetchKeys(lang: str) -> dict:
+    request = requests.get(URL % lang, timeout = 10)
+    request.raise_for_status()
+    request.encoding = 'utf-8'
+    content = BeautifulSoup(request.text, 'lxml').select('.content')[0]
+
+    items = []
+    for element in content.children:
+        try:
+            if element['id'] == 'generic-volume-license-keys-gvlk':
+                items = []  # GVLK record begin
+        except: pass
+        if element.name in ['h3', 'h4', 'table']:  # match target DOM
+            items.append(element)
+    return analyseKeys(items)
+
+
+ret = fetchKeys('zh-cn')
+print(json.dumps(ret))
+
+ret = fetchKeys('en-us')
+print(json.dumps(ret))