How To Create License Key For A Software In Vb6 Array Function
I have made a program in Visual Basic 2010, and I need a way to protect it so that when someone has purchased the program, they can't simply send the setup folder to someone else and they could use it. From what I have read, it looks like a good way to do this is to have an online database which the program checks the serial key to see if it has already been registered, however as I'm still new to making programs, I have no idea how to do this. Any help would be greatly appreciated, thanks for your time.
Visual Basic.NET (VB.NET) is a multi-paradigm, object-oriented programming language. Round brackets (parentheses) are used with arrays, both to declare them. NET program, a version of the classic 'Hello world' example created as a. NET, whereas in Visual Basic 6 there were different conventions for functions. Throughout this example we'll create a simple Visual Basic project using. End Function ' Use this function to register the application when the application is. In Current User Software Your Company Your Product Registration Key and can.
You could just use the users email address and hash it (SHA1 with some salt). Once it's been used store a value in a database so you know it has already been registered. This way you don't need to worry about generating registration keys or storing them. You'd need a mechanism if the user ever needed to re-install though, Stevens suggestion of using the machine UUID is a good example, that way they can re-install as many times on the same machine but if they install on another machine (or a new installation of windows) you'll need to verify this some other way.
Taken from The example below doesn't add salt, this is important as it will stop people just sha1 hashing another users email and using it as a key. It just avoids you having to generate and store registration/serial keys. The string 'secretUSEREMAILsecret' when hashed will always be the same, but it cannot be reversed back into that string. So you can generate a serial key based on their email address and all you have to store is their email. So at registration you could have two fields, email and serial/key which then connects to your service and validates. You'll still need a way of dealing with re-installs but using the UUID of the machine is a good technique. – Aug 8 '13 at 20:38 •.
You need to understand the concept of hashing because it can help you to plug a lot of holes. For instance, something that works for us is on installation, the user has to enter their details (Company Name, etc) plus unique serial number. This is all stored in the database, plus a hash built from all those details. The company name then appears on all the reports etc.
On startup the app regenerates the hash and checks it matches the stored value. If they modify anything in the db using SSMS etc (num of users, lic to date) the hash fails and the app won't run. – Aug 9 '13 at 0:30 •. If you're going down that road, you'll need a way to identify: • your users • machines that run your application User identification should be pretty straightforward.
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Usually people know their own names and are able to type it into a textbox. For the second problem, you could use WMI in order to get the UUID of a computer (see ), which is unique for every computer. (To access WMI services in.NET, you need to add a project reference to ). Once you have that set up, you'll need to set up your database in a way that allows it to store associations between your users' accounts and computer UUIDs.
From there on, it's just standard programming logic. On a new installation, automatically add the UUID to the database. On an existing installation, check if the UUID is still in the database. When uninstalling, remove the UUID from the database. Depending on your licensing terms, you'll probably want to restrict a user account to n unique installations (UUIDs). This won't stop me from letting my mother use my login details without paying, but it will prevent mass account sharing.