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);