How can I protect the license file

Question

Hello support team

I am testing your Mail.dll for our product in the hope to buy it.

If I unlock the trial version I need the license XML file. This file must be exist in the running folder from the application.
I understand that.

But If we deliver the license file to customers with our product, the license file can use from other foreign users or other people can use the file in their own projects. Is that correct?

There are any methods to avoid this or have you other ideas?

Thanks

Answer 1

There are other methods. I wouldn't like to discuss it in public though.

The license is cryptographically signed, and it can not be modified without making it invalid. It also contains buyers company name.