Any "patch", "keygen", or "crack" is a program specifically written to bypass the software's legal copy protection. Because of their nature, they are a primary vector for malware. There are concrete examples of this. In one case, a security analyst scanning a user's computer found a file called DFX.v10.xx patch.rar (a common crack file) which was immediately flagged as "Win32/HackTool.Patcher.T", a potentially unsafe application that can be used to compromise a system.
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