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A keygen, short for "key generator," is a software tool that generates a valid product key or serial number for a particular software application. In the case of Sony Vegas Pro 11, a keygen would generate a key that unlocks the full features of the software, allowing users to access all its capabilities without having to purchase a license.
Using a keygen or "crack" to activate software is a form of digital piracy, but beyond the legal implications, the primary concern for most users is cybersecurity. Keygens are frequently used as "Trojan horses." Because these programs must interact with your system registry to bypass software locks, they often require you to disable your antivirus software.