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I'm currently involved in developing a product (developed in C#) that'll be available for downloading and installing for free but in a very limited version. To get access to all the features the user has to pay a license fee and receive a key.
Note: If you are on subscription, you may no longer need to enter a serial number or product key; you just need to sign in. Serial numbers are never required for launching products with network licenses Skip to main content. See: Find Serial Numbers & Product Keys for Educational Licenses. Physical Media. Follow Free Key Generator. Free Key Generator Web Site. Other Useful Business Software. Flex Delivers What You Need. The first fully-programmable contact center platform. A cloud-based contact center platform that’s infinitely flexible and instantly deployable Flex delivers what you need to run an omnichannel contact center out-of.
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That key will then be entered into the application to 'unlock' the full version. As using a license key like that is kind of usual I'm wondering: • How's that usually solved? • How can I generate the key and how can it be validated by the application?
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• How can I also avoid having a key getting published on the Internet and used by others that haven't payed the license (a key that basically isn't 'theirs'). I guess I should also tie the key to the version of application somehow so it'll be possible to charge for new keys in feature versions. Anything else I should think about in this scenario? Caveat: you can't prevent users from pirating, but only make it easier for honest users to do the right thing. Assuming you don't want to do a special build for each user, then: • Generate yourself a secret key for the product • Take the user's name • Concatentate the users name and the secret key and hash with (for example) SHA1 • Unpack the SHA1 hash as an alphanumeric string. This is the individual user's 'Product Key' • Within the program, do the same hash, and compare with the product key. If equal, OK.
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But, I repeat: this won't prevent piracy I have recently read that this approach is not cryptographically very sound. But this solution is already weak ( as the software itself has to include the secret key somewhere), so I don't think this discovery invalidates the solution as far as it goes. Just thought I really ought to mention this, though; if you're planning to derive something else from this, beware. I would think that by the time someone is hacking your code (possibly at the assembly level) to find your secret key, they are probably also at the level that they can just bypass your checks entirely. I don't think there's a method of registration so secure that it can survive a good hacker running the program locally. As the original comment said, it's really all about anything that makes it one step harder than simply copying the file.
