Autodesk, the developer of AutoCAD, recommends using its subscription-based model, which provides access to the latest versions of the software, including AutoCAD 2021. By subscribing, you'll receive:

X-Force Keygen is a type of software cracking tool that claims to generate valid product keys or activation codes for Autodesk software, including AutoCAD. These tools are often created by third-party developers and are not affiliated with Autodesk. The term "X-Force" is associated with a group of hackers and software crackers who have been involved in creating and distributing such tools.