GUACAMOLE-2139: Add automatic retrieval of license information where absent. Remove unused license info.

doc/licenses/zxing/AUTHORS

@@ -1,4 +1,6 @@
-# --- BEGIN LICENSE FILE ---
+# Source: https://raw.githubusercontent.com/zxing/zxing/refs/tags/zxing-${VERSION}/AUTHORS
+#
+# --- BEGIN LICENSE FILE [3.5.3] ---
 This project consists of contributions from several people, recognized here for convenience,
 in alphabetical order.
 
@@ -134,4 +136,4 @@ Yakov Okshtein (Google)
 Yao Wei
 Younes CHTIOUI
 Yunhao Tian
-# --- END LICENSE FILE ---
+# --- END LICENSE FILE [3.5.3] ---

doc/licenses/zxing/NOTICE

@@ -1,9 +1,10 @@
 # Name:    ZXing Barcode Scanning Library
 # URL:     https://github.com/zxing/zxing/
-# From:    'ZXing authors' (https://github.com/zxing/zxing/blob/zxing-${DEP_VERSION}/AUTHORS)
+# From:    'ZXing authors' (bundled/zxing/AUTHORS)
 # License: Apache v2.0
+# Source:  https://raw.githubusercontent.com/zxing/zxing/refs/tags/zxing-${VERSION}/NOTICE
 #
-# --- BEGIN LICENSE FILE ---
+# --- BEGIN LICENSE FILE [3.5.3] ---
 Barcode4J
 Copyright 2002-2010 Jeremias Märki
 Copyright 2005-2006 Dietmar Bürkle
@@ -11,4 +12,4 @@ Copyright 2005-2006 Dietmar Bürkle
 Portions of this software were contributed under section 5 of the
 Apache License. Contributors are listed under:
 http://barcode4j.sourceforge.net/contributors.html
-# --- END LICENSE FILE ---
+# --- END LICENSE FILE [3.5.3] ---