Xforce is a "crack" or "keygen" tool that replicates Autodesk’s internal algorithm to generate an Activation Code from a provided Request Code. Historically, it was used by applying a "Memory Patch" to the installation files before generating a code to trick the software into accepting a fake license. Risks of Using Third-Party Keygens Find request code for manual activation - Autodesk
When a legitimate user installed the software, they would be prompted to enter a serial number. The software would then generate a unique based on the hardware configuration of the computer. This request code was essentially the computer saying, "Here is who I am." Autocad 2013 Activation Code Xforce