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Software products from IAR Systems are furnished under a license and may be used and copied only in accordance with the terms expressed in the software license. Working in a development team?
The network license is convenient and cost efficient for a team of developers. It allows you to share a pool of licenses among a group of users over a network. While there is a limit on the number of concurrent users, the number of installed copies that can occupy a license is unlimited. The network license is managed by a license server that is included in the delivery. It is connected to a USB dongle, which makes it easy to move the software to another server and to avoid difficulties in case of hardware failure.
A complete product package is delivered for each user and new users can be added to an existing network license. Working in a global development team? For our customers with operations and development projects at several sites and in different countries, we offer geographical flexibility through Global Network Licenses. The ordinary Network License is restricted to one single geographical site, whereas a Global Network License provides the possibility to have users accessing the same network license from multiple sites globally. Working alone at several locations? A mobile license is a single user license that allows you to be flexible with your work location. It is locked to a USB dongle that you can bring with you and use with any PC anywhere, and works even if the PC is without network connection.
Keeping the license on a dongle also protects your license from hardware failure. Working at the same PC every time? A PC-locked license is locked to a specific PC. It is a personal, single user license and can be used by having physical access to your PC. It also works if the PC is not connected to a network.
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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.
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.
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. A lot of games these days have given up on copy protection and simply take the game content online, in which case the code is out of the hacker's hands. – Dec 4 '12 at 22:56.
There are many ways to generate license keys, but very few of those ways are truly secure. And it's a pity, because for companies, license keys have almost the same value as real cash. Ideally, you would want your license keys to have the following properties:. Only your company should be able to generate license keys for your products, even if someone completely reverse engineers your products (which WILL happen, I speak from experience).
Obfuscating the algorithm or hiding an encryption key within your software is really out of the question if you are serious about controlling licensing. If your product is successful, someone will make a key generator in a matter of days from release. A license key should be useable on only one computer (or at least you should be able to control this very tightly). A license key should be short and easy to type or dictate over the phone. You don't want every customer calling the technical support because they don't understand if the key contains a 'l' or a '1'. Your support department would thank you for this, and you will have lower costs in this area. So how do you solve these challenges?.
The answer is simple but technically challenging: digital signatures using public key cryptography. Your license keys should be in fact signed 'documents', containing some useful data, signed with your company's private key. The signatures should be part of the license key. The product should validate the license keys with the corresponding public key. This way, even if someone has full access to your product's logic, they cannot generate license keys because they don't have the private key. A license key would look like this: BASE32(CONCAT(DATA, PRIVATEKEYENCRYPTED(HASH(DATA)))) The biggest challenge here is that the classical public key algorithms have large signature sizes.
RSA512 has an 1024-bit signature. You don't want your license keys to have hundreds of characters. One of the most powerful approaches is to use elliptic curve cryptography (with careful implementations to avoid the existing patents). ECC keys are like 6 times shorter than RSA keys, for the same strength. You can further reduce the signature sizes using algorithms like the Schnorr digital signature algorithm (patent expired in 2008 - good:) ). This is achievable by product activation (Windows is a good example).
Basically, for a customer with a valid license key, you need to generate some 'activation data' which is a signed message embedding the computer's hardware id as the signed data. This is usually done over the internet, but only ONCE: the product sends the license key and the computer hardware id to an activation server, and the activation server sends back the signed message (which can also be made short and easy to dictate over the phone). From that moment on, the product does not check the license key at startup, but the activation data, which needs the computer to be the same in order to validate (otherwise, the DATA would be different and the digital signature would not validate).
Note that the activation data checking do not require verification over the Internet: it is sufficient to verify the digital signature of the activation data with the public key already embedded in the product. Well, just eliminate redundant characters like '1', 'l', '0', 'o' from your keys. Split the license key string into groups of characters. Besides what has already been stated.
Any use of.NET applications are inherently breakable because of the intermediate language issues. A simple disassembly of the.NET code will open your product to anyone. They can easily bypass your licensing code at that point. You can't even use hardware values to create a key anymore. Virtual machines now allow someone to create an image of a 'licensed' machine and run it on any platform they choose. If it's expensive software there are other solutions.
If it's not, just make it difficult enough for the casual hacker. And accept the fact that there will be unlicensed copies out there eventually. If your product is complicated, the inherent support issues will be create some protection for you. 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#.net) that requires a license key that refers to a license stored in the server's database. 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.NET. 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.
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