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Using keygens is a form of software piracy, which is a direct violation of copyright law. It constitutes circumventing the software's licensing agreement and is therefore illegal. The consequences can be serious:
Entirely free, legal, and continually updated by leading international scientists and engineers. Comparative Overview: Legacy Ecotect vs. Modern Workflows Autodesk Ecotect 2011 Modern Cloud BIM (e.g., Autodesk Insight) Status Discontinued & Unsupported Active & Frequently Updated Simulation Core Proprietary internal algorithms EnergyPlus, Radiance, DOE-2 Processing Power Local CPU (Single-threaded) Cloud-based parallel computing BIM Integration Requires file export/import (DXF/gbXML) Native integration within the design model Security Risk High (if acquired via unauthorized keygens) Zero (Official cloud-secure infrastructure)