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I've used Crypkey in the past. It's one of many available. The only way to do everything you asked for is to require an internet access and verification with a server. 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. This will prevent the key from being used on several different machines.
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.
You could just have a license key for the application, and then check client side if the key is good, but it is easy to distribute this key to other users, and with a decompiler new keys can be generated. I've implemented internet-based one-time activation on my company's software C.
The software hits the server with the key and is given license information that is then encrypted locally using an RSA key generated from some variables a combination of CPUID and other stuff that won't change often on the client computer and then stores it in the registry. It requires some server-side coding, but it has worked really well for us and I was able to use the same system when we expanded to browser-based software.
It also gives your sales people great info about who, where and when the software is being used. Any licensing system that is only handled locally is fully vulnerable to exploitation, especially with reflection in. But, like everyone else has said, no system is wholly secure.
In my opinion, if you aren't using web-based licensing, there's no real point to protecting the software at all. With the headache that DRM can cause, it's not fair to the users who have actually paid for it to suffer.
I strongly believe, that only public key cryptography based licensing system is the right approach here, because you don't have to include essential information required for license generation into your sourcecode. In the past, I've used Treek's Licensing Library many times, because it fullfills this requirements and offers really good price.
It uses the same license protection for end users and itself and noone cracked that until now. You can also find good tips on the website to avoid piracy and cracking.
You can use a free third party solution to handle this for you such as Quantum-Key. Net It's free and handles payments via paypal through a web sales page it creates for you, key issuing via email and locks key use to a specific computer to prevent piracy. A good free code obfuscator is ConfuserEx wich is fast and simple to use and more effective than expensive alternatives.
You should run your finished software through De4Dot and. NetReflector to reverse-engineer it and see what a cracker would see if they did the same thing and to make sure you have not left any important code exposed or undisguised.
Your software will still be crackable but for the casual cracker it may well be enough to put them off and these simple steps will also prevent your code being extracted and re-used.
How to use ConfuserEx? It is not possible to prevent software piracy completely. You can prevent casual piracy and that's what all licensing solutions out their do. Node machine locked licensing is best if you want to prevent reuse of license keys. I have been using Cryptlex for about a year now for my software. It has a free plan also, so if you don't expect too many customers you can use it for free. I solved it by interfacing my program with a discord server, where it checks in a specific chat if the product key entered by the user exists and is still valid.
In this way to receive a product key the user would be forced to hack discord and it is very difficult. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to generate and validate a software license key?
Ask Question. Asked 12 years, 10 months ago. Active 4 months ago. Viewed k times. 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? How can I also avoid having a key getting published on the Internet and used by others that haven't paid the license a key that basically isn't "theirs". Anything else I should think about in this scenario? Andrew Truckle 15k 13 13 gold badges 52 52 silver badges bronze badges.
Riri Riri Add a comment. Active Oldest Votes. 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. But, I repeat: this won't prevent piracy I have recently read that this approach is not cryptographically very sound. Steven A. Lowe 59k 18 18 gold badges silver badges bronze badges. If you are urgently looking for the serial key of a paid software, then here might be the last stop before you give up. Nowadays, it is almost impossible to handle any task in work or study without the help of software, such as image processing, document editor, and speech-to-text.
However, most of those programs only allow paid users to access advanced or even basic features. We have tested dozens of websites and now present you the top 6 free serial keys sites for all kinds of software.
Warning : There are potential risks to install cracked software on computer or mobile phone. It is impossible for the website owners or anyone else to rule out every threat. In case of data loss due to virus attack or any other reasons, make sure to download iReparo Data Recovery Software to get your lost files back as soon as possible.
If the only standard to rate free serial keys websites is the frequency of updating, then Serials. It might not be true currently, because there is no much profit driving after all, but Serials. In addition to the update frequency, Serials. Update date and user rating are two important factors that help users judge whether the free serial keys would work or just a waste of time.
Based on the over , serials in the database, Serials. If we have to pick out some flaws, then there two on this site. First, there is no category for all the serial keys, so you must know clearly which serial key you need.
Second, it does not provide download links, neither for the official packages or cracked copies, but just serial keys. Smart Serials is another serial number collection website. Though this site provides serials keys and crack files, it is compliant with Digital Millennium Act. Updated Mar 9, Go.
Updated Oct 24, Swift. Generate license keys for given company details. Updated Aug 10, JavaScript. Updated Aug 5, Java. Updated Feb 9, Visual Basic. Open support timezone. Open No licence keys sent out with Email "License key delivery".
Updated Dec 12, C. Updated Mar 26, JavaScript. Simple git license generator plugin. Updated Jun 15, Shell. Generate and validate license codes. Updated Aug 20, Swift. Updated Mar 2, PHP. Star 9.
Updated Jun 15, Go. Star 8. Updated Jan 7, Java.
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