Runtime distribution is royalty free.
Only DynamicTwainCtrl.dll is distributable with end user application. All other files and documentations can NOT be distributed.
YOU MUST NOT DISTRIBUTE DYNAMICTWAIN4.LIC.
Dynamic TWAIN is very easy to distribute. Since Dynamic TWAIN is developed directly with pure Win32 API and assembly language, no additional supporting DLL or file is needed to distribute Dynamic TWAIN. JPEG, TIFF and PNG encoders are the built-in feature of Dynamic TWAIN and no additional DLL is needed either.