Download Instant C# Free Edition - A reliable code conversion tool that can process entire VB.NET projects or code snippets, allowing you to convert them to C# projects or code. Create time-limited keys. For a full list of supported features follow visit Ellipter's Features page. Download Get Trial Key Online Keygen Order Compact Product Keys. Product keys are as short as possible: 29 characters length when no product info is embedded. Click for example. Create or verify secure product keys in just 3 lines of code! Another site that does License keys is SP extreme or Open License. The license keys are created with either a base 10 or base 16 integer data set. Most keys are base 16 for all of the numbers. The license key template is a string of characters that represent what actions will be taken when the key is created and decoded. Download Serial Key Generator for Windows to create serial keys for your C#.NET, VB.NET, C Builder, Delphi, and Java applications. Serial Key Generator has had 0 updates within the past 6 months. That's because Registry key formats are inconsistent. I am looking for a key in the format VIDXXXXPIDXXXX, where XXXX are 4 hex digits and is (any) single character. By examining the registry via RegEdit you'll see uppercase, lowercase or a mixture of both. May be a '+' or a '&'. Continuing our series on getting the computer’s serial number in desktop apps in various languages, next up is C/WinRT. From Visual Studio, create a new C Console Application that goes like this: #include #include // Horrors! Mixing C and C!

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Serial port details in C#

SerialPort class available in System.IO.Ports namespace is really simple. When we want to get all port names on the computer there is one method to use: .GetPortNames(). It returns an array with all serial ports names in format COM* where * is a number of the port.

I was creating a debug software for my recent project and I needed to simply stream data from serial port to several controls on the screen. Pretty easy, just connect to the communication port, receive some data, parse it and send to controls. But I didn't want to select a right serial port name manually. Also, I wanted to link the connection automatically. How to filter the serial ports then?

Filtering can easily be done by VID and PID from USB device that is emulating the port. There are two ways of obtaining it. First one is a usage of an external library like USBClassLibrary. Second, the more customizable way is to create an own wrapper around ManagementObjectSearcher class.

At the beginning, we need to specify a list of parameters required by our application. Full list of fields is available here. After that let's create a struct with specific variables:

In this example, we want only VID, PID, COM name, and description.

Next, create simple function for extracting all data:

In the code above we firstly access ManagementObjectSearcher to obtain all serial ports in the system using query. Then we cast results to the desired type and create a list from it. At the end, we map the results by extracting needed information into a previously created struct. Regular expressions are used because VID and PID are stored in one field, which needs to be parsed.

Note, that adding two dependencies listed below is a necessity:

Usage of the function is really simple: List<ComPort> ports = GetSerialPorts(); will return us a list of serial ports in the system with all the additional fields we needed.

Finally if we want to filter our results to devices with specified VID and PID there is an easy way to achieve that:

Example project using these methods is available on GitHub.

How can I create a product key for my C# Application?

I need to create a product (or license) key that I update annually. Additionally I need to create one for trial versions.

Related:

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.g. program features to enable, expiry date, name of the user (if you want to bind it to a user). 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.

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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.

edit: I just want to add, don’t invest too much time in this or think that somehow your convoluted scheme will be different and uncrackable. 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. 🙂

Who do you trust?

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 Discreet in five minutes once they went with a third-party license solution for 3ds Max years ago… Good times!

Seriously, consider rolling your own for having complete control over your algorithm. If you do, consider using components in your key along the lines of:

• License Name – the name of client (if any) you’re licensing. Useful for managing company deployments – make them feel special to have a “personalised” name in the license information you supply them.
• Date of license expiry
• Number of users to run under the same license. This assumes you have a way of tracking running instances across a site, in a server-ish way
• Feature codes – to let you use the same licensing system across multiple features, and across multiple products. 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.

To make a trial license key, simply have set values for the above values that translate as “trial mode”.

And since this is now probably the most important code in your application/company, on top of/instead of obfuscation consider putting the decrypt routines in a native DLL file and simply P/Invoke to it.

Several companies I’ve worked for have adopted generalised approaches for this with great success. Or maybe the products weren’t worth cracking 😉

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. Those who pay. Those who don’t. 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.

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.

Encryption are normally the string of information about the license encrypted using a private key ( digitally signed) and converted to Base64. The public key is distributed with the application. When the Base64 string arrives, it is verified (decrypted) by the public key and if found valid, the product is activated.

There is the option Microsoft Software Licensing and Protection (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 .NET. 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.

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1. Find a CPU bottleneck and extract it to a P/Invokeable DLL file.
2. As a post build action, encrypt part of the DLL file with an XOR
   encryption key.
3. Select a public/private key scheme, include public key in the DLL file
4. Arrange so that decrypting the product key and XORing the two
   halves together results in the encryption key for the DLL.
5. In the DLL’s DllMain code, disable protection (PAGE_EXECUTE_READWRITE)
   and decrypt it with the key.
6. Make a LicenseCheck() method that makes a sanity check of the
   license key and parameters, then checksums entire DLL file, throwing
   license violation on either. Oh, and do some other initialization
   here.

When they find and remove the LicenseCheck, what fun will follow
when the DLL starts segmentation faulting.

If you want a simple solution just to create and verify serial numbers, try Ellipter. It uses elliptic curves cryptography and has an “Expiration Date” feature so you can create trial verisons or time-limited registration keys.

Another good inexpensive tool for product keys and activations is a product called InstallKey. Take a look at www.lomacons.com

The trick is to have an algorithm that only you know (such that it could be decoded at the other end).

There are simple things like, “Pick a prime number and add a magic number to it”

More convoluted options such as using asymmetric encryption of a set of binary data (that could include a unique identifier, version numbers, etc) and distribute the encrypted data as the key.

Might also be worth reading the responses to this question as well

There are some tools and API’s available for it. However, I do not think you’ll find one for free 😉 /current-93-discography-download-torrent.html.

There is for instance the OLicense suite:
http://www.olicense.de/index.php?lang=en

You can check LicenseSpot. It provides:

• Free Licensing Component
• Online Activation
• API to integrate your app and online store
• Serial number generation
• Revoke licenses
• Subscription Management

One simple method is using a Globally Unique Identifier (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.Guid.NewGuid().

I hope it helps.

Please check this answer: https://stackoverflow.com/a/38598174/1275924

The idea is to use SKM Platform as the license server. Here’s a step-by-step example (in VB.NET)

Nissan sentra manual download. 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 Keygen, a licensing REST API built for developers.

Since you mentioned wanting 2 “types” of licenses for your application, i.e. a “full version” and a “trial version”, we can simplify that and use a feature license model where you license specific features of your application (in this case, there’s a “full” feature-set and a “trial” feature-set).

To start off, we could create 2 license types (called policies in Keygen) and whenever a user registers an account you can generate a “trial” license for them to start out (the “trial” license implements our “trial” feature policy), which you can use to do various checks within the app e.g. can user use Trial-Feature-A and Trial-Feature-B.

And building on that, whenever a user purchases your app (whether you’re using PayPal, Stripe, etc.), you can generate a license implementing the “full” feature policy and associate it with the user’s account. Now within your app you can check if the user has a “full” license that can do Pro-Feature-X and Pro-Feature-Y (by doing something like user.HasLicenseFor(FEATURE_POLICY_ID)).

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I mentioned allowing your users to create user accounts—what do I mean by that? I’ve gone into this in detail in a couple other answers, but a quick rundown as to why I think this is a superior way to authenticate and identify your users:

1. User accounts let you associate multiple licenses and multiple machines to a single user, giving you insight into your customer’s behavior and to prompt them for “in-app purchases” i.e. purchasing your “full” version (kind of like mobile apps).
2. We shouldn’t require our customers to input long license keys, which are both tedious to input and hard to keep track of i.e. they get lost easily. (Try searching “lost license key” on Twitter!)
3. Customers are accustomed to using an email/password; I think we should do what people are used to doing so that we can provide a good user experience (UX).

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 supports doing that as well). I’m just offering another way to go about handling that aspect of licensing and hopefully provide a nice UX for your customers.

Finally since you also mentioned that you want to update these licenses annually, you can set a duration on your policies so that “full” licenses will expire after a year and “trial” licenses last say 2 weeks, requiring that your users purchase a new license after expiration.

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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.

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