Enabling the license key approach for a WinForms application

Question

I need some guidance on where to explore the further inclusion of enabling a license key for a WinForms application. This includes those key concepts that you often see, for example:

• 30 day trial
• A license key is required to unlock the application beyond this.
• Perhaps the ability to unlock user functionality using this approach

What is the normal approach that people use to achieve this? Is it possible to use only the VS2008 Pro version, or are there well-known libraries that help? It would be nice to think that there are "client libraries" that make it easy to integrate this into a single Windows Forms application.

[Possible duplicates]

• https://stackoverflow.com/questions/1424955/prevent-casual-piracy-for-simple-utility

• The safest way to license software

• What is the best way to obfuscate your license code for a C # product?

• How to generate and verify a software license key?

Answer 1

There were many other questions on this topic at StackOverflow. Please search in the future.

https://stackoverflow.com/questions/1424955/prevent-casual-piracy-for-simple-utility

https://stackoverflow.com/questions/60497/whats-the-best-way-to-protect-a-windows-application-from-piracy

The safest way to license software

How do I better obfuscate your C # license verification code?

How to generate and confirm a software license key?

and etc.