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The lay line is the straight line which will allow a boat to round the windward mark in the shortest possible time without tacking This is affected by wind speed, direction and current ows Leach is the aft edge of the sail Lee bowed You are lee bowed by a boat close to leeward giving you dirty wind Leeward (pronounced loo-erd ) A boat s leeward side is the side that is or, when she is head to wind, was away from the wind However, when sailing by the lee or directly downwind, her leeward side is the side on which her mainsail lies The other side is her windward side When two boats on the same tack overlap, the one on the leeward side of the other is the leeward boat The other is the windward boat Lifted tack.

As time moves on, more and more computers are permanently connected to the Internet, and the connections are getting faster and more reliable. This has created a natural transition towards server-based software. Server-based software isn t a suitable model for every type of software, but certain applications can really benefit from it. This model is mentioned here because it is a highly secure protection model (though it is rarely seen as a protection model at all). It is effectively impossible to access the service without the vendor s control because the vendor owns and maintains the servers on which the program runs.

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The reality is that software-based solutions can never be made uncrackable. As long as the protected content must be readable in an unencrypted form on the target system, a cracker can somehow steal it. Therefore, in order to achieve unbreakable (or at least nearly unbreakable) solutions there must be dedicated hardware that assists the protection technology. The basic foundation for any good protection technology is encryption. We must find a way to encrypt our protected content using a powerful cipher and safely decrypt it. It is this step of safe decryption that fails almost every time. The problem is that computers are inherently open, which means that the platform is not designed to hide any data from the end user. The outcome of this design is that any protected information that gets into the computer will be readable to an attacker if at any point it is stored on the system in an unencrypted form. The problem is easily definable: Because it is the CPU that must eventually perform any decryption operation, the decryption key and the decrypted data are impossible to hide. The solution to this problem (regardless of what it is that you re trying to protect) is to include dedicated decryption hardware on the end user s computer. The hardware must include a hidden decryption key that is impossible (or very difficult) to extract. When the user purchases protected content the content provider encrypts the content so that the user can only decrypt it using the built-in hardware decryption engine.

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A crypto-processor is a well-known software copy protection approach that was originally proposed by Robert M. Best in his patent Microprocessor for Executing Enciphered Programs [Best]. The original design only addressed software piracy, but modern implementations have enhanced it to make suitable for both software protection and more generic content protection for digital rights management applications. The idea is simple: Design a microprocessor that can directly execute encrypted code by decrypting it on the fly. A copy-protected application implemented on such a microprocessor would be difficult to crack because (assuming a proper implementation of the crypto-processor) the decrypted code would never be accessible to attackers, at least not without some kind of hardware attack. The following are the basic steps for protecting a program using a cryptoprocessor. 1. Each individual processor is assigned a pair of encryption keys and a serial number as part of the manufacturing process. Some trusted authority (such as the processor manufacturer) maintains a database that matches serial numbers with public keys.

The lifted tack is the tack where a boat has to head up (to keep the same sail settings) as a result of a change in wind direction Lifting is where the wind direction changes (lifts), forcing the boat to head up to keep the same sail settings..

2 When an end user purchases a program, the software developer requests the user s processor serial number, and then contacts the authority to obtain the public key for that serial number 3 The program binaries are encrypted using the public key and shipped or transmitted to the end user 4 The end user runs the encrypted program, and the crypto-processor decrypts the code using the internally stored decryption key (the user s private key) and stores the decrypted code in a special memory region that is not software-accessible 5 Code is executed directly from this (theoretically) inaccessible memory While at first it may seem as though merely encrypting the protected program and decrypting it inside the processor is enough for achieving security, it really isn t.

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