CATIA V5 R21 requires a valid license key to activate the software. If you don't have a license key, you can use a crack to activate the software. However, using a crack may violate the software's terms and conditions.
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Dassault Systèmes actively pursues copyright infringement. Companies caught using unlicensed CATIA face fines reaching hundreds of thousands of dollars. Individuals can be sued or receive cease-and-desist letters from their ISP. CATIA V5 R21 requires a valid license key