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If I use DateTime.Now as part of software licensing authentication to enforce the number of days software can be used, can this be circumvented by simply changing the system clock?
If so is there a better way to get real UTC time?
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The Now property returns a DateTime value that represents the current date and time on the local computer.
From MSDN you'll find that DateTime. Now has an approximate resolution of 10 milliseconds on all NT operating systems.
The property UtcNow of the DateTime class returns the current date and time of the machine running the code, expressed in UTC format. UTC is a universal format to represent date and time as an alternative to local time. Also known as the GMT+00 timezone.
If I use DateTime.Now as part of software licensing authentication to enforce the number of days software can be used, can this be circumvented by simply changing the system clock?
DateTime.Now uses the system clock, so yes it could be circumvented.
If so is there a better way to get accurate system time?
Yes, you could query a time server over the www. But you know, even this could be circumvented because the user can modify his hosts file and replace the address you are using with his own proxy and return whatever time he likes. So it will all depend on how far do you want to get into protecting your software. If you really care about the intellectual property of your software you are better of purchasing a commercial licensing software.
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