reviewing 008

Tom-Dynamsoft · Tom-Dynamsoft · commit 52e78e116028 · 2020-10-13T13:50:19.000+08:00
diff --git a/about/license.md b/about/license.md
@@ -13,4 +13,6 @@ The official [DWT License Agreement](https://www.dynamsoft.com/Products/WebTwain
 
 ## QA
 
-### 
+### When is license verified
+
+`DWT` verifies whether there is a valid license when a [ `WebTwain` instance is created]({{site.indepth}}features/initialize.html#creating-the-webtwain-instance). Then for individual modules such as the PDF Rasterizer, or the Barcode Reader, the license is verified when you try to invoke their respective APIs.
