AutoCAD is the most widely used CAD / CAM software in the world. Designed by the company AutoDesk, it comes in several products such as AutoCAD Mechanical, AutoCAD Map, Architectural Studio etc., each adapted to a profession. There are two versions, the so-called "full" version and the "light" version called LT on which it is not possible to add applications.
BricsCAD is an AutoCAD clone, published by Bricsys. This ever-evolving version is the closest to AutoCAD and certainly the most stable of all clones. Most of the site's apps are available for BricsCAD and work the same way as on AutoCAD.
ZwCAD is a Chinese AutoCAD clone. The interface is the same as that of AutoCAD, as well as commands, and in principle, applications written for AutoCAD can run on ZwCAD.
To find your serial number, click the 'Help' button ( ) of the add-on toolbar.
A dialog box displays, showing this number (in blue) :