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FIR Designer is available as a subscription license (with continual feature updates) and a perpetual license (with only bug fixes).
With the subscription license, a credit card is kept on file and charged annually. Shortly before the annual charge, you will receive an email notice and can cancel the subscription. Once the subscription is cancelled, the software reverts to demo mode and you can’t save projects, systems and can’t export filters.
With the perpetual license, you can use the product indefinitely.
All our products contact our license server periodically to verify that the license is still valid. This helps us reset your license in the event of a computer failure or loss.