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How to read processor serial number

May,26 2003

To read processor serial number or PID you can use pid.dll with interface written in toolbook.The DLL written in Visual C++ contains two functions
linkDLL32 "pid.dll"
   INT DetectPID()
   INT ReadPID(POINTER32)
end
First one is used to detect whether serial number is present or it was disabled. Returns 1 (true) if test is positive. You mustn't read PID if it's disabled because this will lead to DLL crash as a result of execution of "illegal operation". Function ReadPID() returns 96 bit (6 words) serial number. OpenScript code in the sample pid.tbk book converts it to hexadecimal format and you may expect appearing of something like 0000-0000-0882-0C04-06B1-0000, which is actually the serial of my Celeron1200 processor. First two words are processor signature.

Using DLL for software protection

You can use this dll and the detected PID for toolbook applications protection similar to what was done in SysProt based on HDD serial number. But before you start you should be aware that the weakest point in this type of protection is pid.dll itself. Anybody can replace it with his own DLL that will return the same PID number on any computer. To avoid this the version of pid.dll for building protecting system must contain additional function that converts number received from toolbook using a secret algorithm and sends it back. The presence of this algorithm will protect DLL from substituting.
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PID sample book (TB 8) with DLL

     
   

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