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I am building an application which has a dynamic product key. I am trying to integrate these features

If user uninstall this app and again installs it then product key should not be void it should take the same product key for it.

I am going to take the mac address and stores it to a web server I am doing online verification so now the problem is that if the user changes the mac address(the network adapter) so key won't work.

So how can I make this valid? Is there any alternative to the MAC address which almost stays constant?

A little pseudo code that describes how I would verify the product key:

if(mac remains same || any alternative method stays same)
{
    priduct_key = valid;
}
Sendhilkumar Alalasundaram
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crackdac0d3
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    Where did you get the idea that the MAC Address was a good thing to lock to? – Ňɏssa Pøngjǣrdenlarp Apr 21 '16 at 17:53
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    HDD-identifier is also commonly used. (http://stackoverflow.com/questions/4084402/get-hard-disk-serial-number). But in the end, I'm convinced that every application can be cracked, no matter how hard you try to protect it. – Maximilian Gerhardt Apr 21 '16 at 17:54
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    The hard disk serial is a worse idea. A user should be able to upgrade their hardware without invalidating a software license. If you are doing online validation, an abstract key you create could work. Something like HD Serial or MAC Address assumes a single product and single version. – Ňɏssa Pøngjǣrdenlarp Apr 21 '16 at 17:56
  • HDD-identifier is a good option – crackdac0d3 Apr 21 '16 at 18:01
  • Thanks plutonix hard disk serial is a good idea it uses for digital forensic also – crackdac0d3 Apr 21 '16 at 18:09

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