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This helps prevent unauthorized use of the software; for example, a user attempting to extend the end date of a trial license. Note that any clock discrepancy of less than 24 hours will not be detected as tampering. For example, a user can change the clock to reflect a different time zone without causing an error.
Whether a system clock check is done by default depends on the type of license, as follows:
| License Type | Default System Clock Check Behavior |
|---|---|
| Local | Check system clock only when end date is set. Otherwise, do not check system clock. |
| Network | Do not check system clock. |
| Trial | Check system clock. |
| Grace | Do not check system clock. |
| Borrow | Do not check system clock. |
The system clock check evaluates several criteria to determine whether the system time has been tampered with. Under some circumstances, the check can return a false positive. For example, a user might accidentally change the clock to a future time. Normally, the user can reset the system clock to the correct time to resolve the issue; however, in some cases this may not work.
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