Infralution Support

[issoft]

There is a way to validate with a public server if a license is valid?

My idea is to generate a serial number and put it on a database as avaliable. When a user installs the application the serial number is not more avaliable until the user un-installs the application.

This way a serial can not be shared between users.

If this is not possible with your current Licensing system, can it be modified by us to allow this working mode?

Thanks in advance.

[Infralution]

If your server supports ASP.NET then you can simply call EncryptedLicenseProvider.ValidateLicenseKey to verify the key. But actually if you stored the generated keys in an online database you would not need to do this because the if the key is in the database it must be genuine.

To prevent someone finding the location of your license key file (or registry entry) and simply manually copying it to another machine you would have to generate a key that is locked in some way to the PC. This sort of scheme is call "Product Activation" and in practice can have som significant drawbacks. See our FAQ on this topic:

http://www.infralution.com/phpBB2/viewtopic.php?t=5

You can implement this type of scheme using ILS - but you need to think carefully about the implications for you and your customers.
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Infralution Support

[issoft]

Ok, everything is hackable, but with a online server validating if the serial has been used before or not is getting things harder.

We don't want to create activation schemas but we do not want to users being able to copy & paste serials from one machine to another.

We will think about this matter a bit more.

As you're giving the code with the product I think that we will be able to implement this.