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C# product key example
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And since your application is now self-serve, you can allow your customers to purchase additional features directly from within your application! Anything else I should think about in this scenario? The application needs to sign in to the server with the key, and then you need to store the session details, like the IP address. The checksum number class uses checksum routines that are pretty basic.
For the library part, I ran FxCop routinely to make sure many of the best practices are adhered to. In the past, I've used many custodes, because it fullfills this requirements and offers really good price. Several companies I've worked for have adopted generalised approaches for this with great success. Additional advanced algorithms can be added simply by adding the routine and an enumerated type. Keygen also has webhooks whether you use it or not, all this is still sincere. History If everyone is interested I can put the code at SourceForge as well. This will prevent the key from being used on several different machines.
You can integrate Keygen to talk with your payment provider using webhooks from both sides think: customer. Of course, there would be other relationships as well, including complex relations like, if the second digit of the first group is odd, then the last digit of the last group should be odd too. This is usually not very popular with the users of the application, and unless this is a very expensive and complicated application it's not worth it.
- So how do you solve these challenges? It also gives your sales people great info about who, where and when the software is being used.
You can do something like create a record which contains the data you want to authenticate to the application. This could include anything you want - e. Then encrypt that using some crypto algorithm with a fixed key or hash it. Then you just verify it within your program. One way to distribute the license file on windows is to provide it as a file which updates the registry saves the user having to type it. Beware of false sense of security though - sooner or later someone will simply patch your program to skip that check, and distribute the patched version. Or, they will work out a key that passes all checks and distribute that, or backdate the clock, etc. It doesn't matter how convoluted you make your scheme, anything you do for this will ultimately be security through obscurity and they will always be able to this. Even if they can't someone will, and will distribute the hacked version. Same applies even if you supply a dongle - if someone wants to, they can patch out the check for that too. Digitally signing your code won't help, they can remove that signature, or resign it. You can complicate matters a bit by using techniques to prevent the program running in a debugger etc, but even this is not bullet proof. So you should just make it difficult enough that an honest user will not forget to pay. Also be very careful that your scheme does not become obtrusive to paying users - it's better to have some ripped off copies than for your paying customers not to be able to use what they have paid for. Another option is to have an online check - just provide the user with a unique ID, and check online as to what capabilities that ID should have, and cache it for some period. All the same caveats apply though - people can get round anything like this. Consider also the support costs of having to deal with users who have forgotten their key, etc. It won't, and cannot be as long as people control the hardware and OS your program runs on. Developers have been trying to come up with ever more complex schemes for this, thinking that if they develop their own system for it then it will be known only to them and therefore 'more secure'. But it really is the programming equivalent of trying to build a perpetual motion machine. I've always considered this area too critical to trust a third party to manage the runtime security of your application. Once that component is cracked for one application, it's cracked for all applications. It happened to in five minutes once they went with a third-party license solution for years ago... Seriously, consider rolling your own for having complete control over your algorithm. Of course if it's cracked for one product it's cracked for all. Then checksum the hell out of them and add whatever reversable encryption you want to it to make it harder to crack. Several companies I've worked for have adopted generalised approaches for this with great success. Or maybe the products weren't worth cracking ; If you are asking about the keys that you can type in, like Windows product keys, then they are based on some checks. If you are talking about the keys that you have to copy paste, then they are based on a digitial signature private key encryption. A simple product key logic could be to start with saying that the product key consists of four 5-digit groups, like abcde-fghij-kljmo-pqrst, and then go on to specify internal relationships like f+k+p should equal a, meaning the first digits of the 2, 3 and 4 group should total to a. This means that 8xxxx-2xxxx-4xxxx-2xxxx is valid, so is 8xxxx-1xxxx-0xxxx-7xxxx. Of course, there would be other relationships as well, including complex relations like, if the second digit of the first group is odd, then the last digit of the last group should be odd too. This way there would be generators for product keys and verification of product keys would simply check if it matches all the rules. The public key is distributed with the application. Whether it's trivial or hard to crack, I'm not sure that it really makes much of a difference. The likelihood of your app being cracked is far more proportional to its usefulness rather than the strength of the product key handling. Personally, I think there are two classes of user. The ones that do will likely do so with even the most trivial protection. Those who don't will wait for a crack or look elsewhere. Either way, it won't get you any more money. There is the option SLP Services as well. After reading about it I really wish I could use it. I really like the idea of blocking parts of code based on the license. Hot stuff, and the most secure for. Interesting read even if you don't use it! Microsoft® Software Licensing and Protection SLP Services is a software activation service that enables independent software vendors ISVs to adopt flexible licensing terms for their customers. Microsoft SLP Services employs a unique protection method that helps safeguard your application and licensing information allowing you to get to market faster while increasing customer compliance. Note: This is the only way I would release a product with sensitive code such as a valuable algorithm. I have to admit I'd do something rather insane. Oh, and do some other initialization here. When they find and remove the LicenseCheck, what fun will follow when the DLL starts. The trick is to have an algorithm that only you know such that it could be decoded at the other end. Might also be worth reading the responses to as well One simple method is using a GUID. GUIDs are usually stored as 128-bit values and are commonly displayed as 32 hexadecimal digits with groups separated by hyphens, such as 21EC2020-3AEA-4069-A2DD-08002B30309D. Use the following code in C by System. I hope it helps. I'm going to piggyback a bit on frankodwyer's great answer and dig a little deeper into online-based licensing. I'm the founder of , a licensing REST API built for developers. And building on that, whenever a user purchases your app whether you're using PayPal, Stripe, etc. I mentioned allowing your users to create user accounts—what do I mean by that? Of course, if you don't want to handle user accounts and you want your users to input license keys, that's completely fine and Keygen. I'm just offering another way to go about handling that aspect of licensing and hopefully provide a nice UX for your customers. I could dig in more, getting into associating machines with users and things like that, but I thought I'd try to keep this answer short and focus on simply licensing features to your users.