diff --git a/AUTHORS b/AUTHORS
index f8dfe3a6..be7b269f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -20,7 +20,9 @@ $ Contributors and volunteers of the upstream repo, having no responsibility in
     - Notifier window and Tooltip UI.
     - NSStringUtils and FSEventStreamHelper.
     - App-style installer (only preserved for developer purposes).
-    - etc.
+    - InputSource Helper.
+    - mgrPrefs (userdefaults manager).
+    - apiUpdate.
 - Mengjuei Hsieh:
     - McBopomofo for macOS 1.x main developer and architect.
     - The original C++ version of the User Override Module.
diff --git a/COPYING b/COPYING
new file mode 100644
index 00000000..cede6bd5
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,25 @@
+The vChewing Input Method is derived from OpenVanilla McBopomofo project under:
+
+	SPDX-License-Identifier: MIT
+
+The vChewing Input Method is provided under:
+
+	SPDX-License-Identifier: MIT
+
+with one extra requirements (turning it into MIT-NTL license):
+
+	No trademark license is granted to use the trade names, trademarks, 
+	service marks, or product names of Contributor, except as required 
+	to fulfill notice requirements above.
+
+Being under the terms of the MIT-NTL License only, according with:
+
+	./LICENSES.txt
+
+Please see:
+
+	./AUTHORS
+
+for more details.
+
+All contributions to the vChewing Input Method are subject to ./AUTHORS file.
diff --git a/CREDITS b/CREDITS
new file mode 100644
index 00000000..cede6bd5
--- /dev/null
+++ b/CREDITS
@@ -0,0 +1,25 @@
+The vChewing Input Method is derived from OpenVanilla McBopomofo project under:
+
+	SPDX-License-Identifier: MIT
+
+The vChewing Input Method is provided under:
+
+	SPDX-License-Identifier: MIT
+
+with one extra requirements (turning it into MIT-NTL license):
+
+	No trademark license is granted to use the trade names, trademarks, 
+	service marks, or product names of Contributor, except as required 
+	to fulfill notice requirements above.
+
+Being under the terms of the MIT-NTL License only, according with:
+
+	./LICENSES.txt
+
+Please see:
+
+	./AUTHORS
+
+for more details.
+
+All contributions to the vChewing Input Method are subject to ./AUTHORS file.