Software Key Secure Encryption

[Davider]

How can I securely encrypt a registration key for software? Thanks in advance.

e.g:
 

Code:

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using System;
using System.Linq;
using GemBox.Document;

ComponentInfo.SetLicense("DN-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");

var document = DocumentModel.Load(@"C:\Users\Administrator\Desktop\toPrint.docx");
int pageCount = document.GetPaginator().Pages.Count;
Console.WriteLine(pageCount);

[Gintaras]

What is the purpose? Will you share the code or compiled .exe with others and they should not see the key?

[Davider]

GemBox.Document is a commercial component, and if the activation key is exposed, it could be misused, leading to potential issues.  
I would like to know what viable solutions exist in this situation.

[Gintaras]

OK, I assume the C# code is for sharing as .exe. To encrypt the key you can use Convert2.AesEncryptS and Convert2.AesDecryptS.

[Davider]

Thanks for your help.  
I looked at the relevant examples in the cookbook, but I couldn't understand how to use them.