Index: source/tools/hooks/license_year.py
===================================================================
--- source/tools/hooks/license_year.py
+++ source/tools/hooks/license_year.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+import os
+import sys
+from datetime import date
+from re import compile
+try:
+    from svn.local import LocalClient
+    from svn.exception import SvnException
+except ImportError:
+    sys.stderr.write('Required library: https://pypi.python.org/pypi/svn\n')
+
+project_root = os.path.abspath(os.path.join(os.path.abspath(__file__), '..', '..', '..'))
+client = LocalClient(project_root)
+license_regexp = compile(r'^/\* Copyright \([cC]?\) ([\d]+) Wildfire Games')
+valid_extensions = ['.cpp', '.cc', '.cxx', '.c', '.h', '.hpp', '.hxx']
+current_year = date.today().year
+
+for status in client.status():
+    if status.type_raw_name != 'modified':
+        continue
+    path = status.name
+
+    if not os.path.isfile(path):
+        continue
+
+    ext = os.path.splitext(path)[1].lower()
+    if ext not in valid_extensions:
+        continue
+
+    with open(path, 'rt') as handle:
+        data = handle.read()
+        match = license_regexp.search(data)
+
+        if not match:
+            # Only warning about it, because it can be the file of a third party library.
+            sys.stderr.write('License header not found in "{}"\n'.format(path))
+            continue
+
+        license_year = match.group(1)
+        if not license_year:
+            sys.stderr.write('Invalid license year found in "{}"\n'.format(path))
+            continue
+
+        license_year = int(license_year)
+        if license_year == current_year:
+            continue
+
+        def year_replacer(match):
+            return match.group(0).replace(match.group(1), str(current_year))
+        data = license_regexp.sub(year_replacer, data)
+        handle.close()
+
+        with open(path, 'wt') as handle:
+            handle.write(data)
+        sys.stderr.write('Wrong license year {} was replaced in "{}"\n'.format(license_year, path))
+