If you're concerned about the risks associated with using a keygen, consider these alternatives:

It is important to address that Xforce Keygen is a tool used to bypass software licensing. While it might seem like a quick fix for accessing AutoCAD 2011

: Using unauthorized activation tools violates Autodesk’s Terms of Use and can lead to civil or criminal penalties.

If you need a legitimate solution for running older AutoCAD versions, let me know, and I’ll be glad to write a detailed, helpful guide on that topic.