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The authors propose a copyright protection system for Android platform, which is an efficient way of using cryptographic technology to distribute application securely, and at runtime, only legitimate user can decrypt the application to run it. Legitimate users can get information needed to decrypt by using their authentication information, but illegitimate users can't get such information. The methods in this paper incorporates trade-offs to ensure that applications are not slowed down very much by the overhead of their protection system.
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