Q. Why is it important for protection technologies to encrypt key code?

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Q. What is the main difference between a simple XOR algorithm and CBC?

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Q. Why is it difficult to hide the key from cracker’s eyes in copy protection technologies?

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Q. What does Defender do before each function returns to the caller?

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Q. Why does reencrypting each function create an inconvenience for crackers?

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Q. What is the obfuscated interface in Defender?

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Q. Why does the obfuscated interface make it difficult for crackers to find important code areas in the target program?

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Q. How does the interface attempt to attach to the operating system?

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Q. How does Defender access the operating system after the user-mode components are copied to a random memory address?

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Q. What impact does the obfuscated interface have on the program's memory consumption and performance?

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Q. How does Defender obfuscate the calls to operating system APIs?

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Q. What is the weakness in Defender's technique of obfuscating API calls?

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Q. What was the purpose of adding the call to IsDebuggerPresent API in Defender?

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Q. What is the impact of obfuscating the interface with the operating system?

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Q. What is the purpose of the Processor Time-Stamp Verification Thread in Defender?

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Q. Why is it important to directly access the hardware time-stamp counter using a low-level instruction in the Processor Time-Stamp Verification Thread?

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Q. What would happen if the encryption on each key function was not implemented in the Processor Time-Stamp Verification Thread?

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Q. What modifications can be made to a time-stamp verification thread to make it more difficult to remove?

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Q. Is the current implementation of the verification thread safe for commercial use?

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Q. What changes should be made to the counter constant in a commercial product environment?

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