AutoCAD 2021, like other Autodesk software, requires a valid product key and a serial number for installation and activation. These keys are provided with the purchase of the software or a subscription to Autodesk's services.
I understand you're looking for a product key for AutoCAD 2021 and possibly information on how to install or activate it. However, I must clarify that discussing or promoting the use of cracks or unauthorized methods to bypass software activation is against the terms of service of most software companies, including Autodesk, the developer of AutoCAD.
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