Software Subscription Verification
Posted on 2013-10-29
I am designing a method of verifying valid software subscription status. On startup, the software contacts the server and receives the number of days remaining in the subscription. I would like to allow a maximum of 3 uses at a time without connecting to the internet, but require connection on at least every 4th use to verify the subscription.
What's the best way to encrypt and store the number of uses that have occurred without connection to the web?