How can I make auto deletable my Main-GUI (*.exe) programm in specific date/time to prevent extra use?

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Morteza
Morteza 2012-12-21
Hi I write the GUI code and make it as *.exe (stand alone application). But I want to delete main file (*.exe) in specific date/Time to prevent extra use. How can I do this?

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Doug Hull
Doug Hull 2012-12-21
This is a bad idea. Do not do this. People will be able to undo it anyways.
That being said, just call out to the system to delete the files.
delete('file.ext')
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Morteza
Morteza 2012-12-21
Thanks my friend for your answer but: If they have *.exe file they can change the date/Time of system back and use the program again.... Is there any way to make program that understand the current changed time is not real in system or make prevent the use of program again? because when I changed my computer date/Time I could use the program again. what should I do about this problem?
Walter Roberson
Walter Roberson 2012-12-21
There are some cross-checks that can be done, such as examining the dates of other files to see if any of them are in the "future".
There are techniques such as contacting a remote site and asking it for the current time using an encrypted transmission. It is difficult to make this completely secure, though. (Quantum Encryption.)
If you are not able to use quantum secure channels, then there is no way to really prove what time it "really" is. At most you can make it a nuisance for people to break the software.
If your program is sufficiently valuable, then people will find a way to break it. There are people who specialize in doing this just to prove that they can, that they are more clever than you. Therefore the best way to ensure that your program does not get broken is to make your software so useless than no-one would want to use it.

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