How to protect application written in C++ .NET

I have written an application and now I want to protect in. Application is written in C++ using .NET framework. I want to know what methods can I use in order to protect application. For example if I give application to开发者_如何学C "A", "A" must register it and only after that he can use it. And if "A" give application to "B", "B" cant use it until he register it.

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You will not be able to stop a determined user from breaking your system. You need a system that would slow down a determined user and be low-friction for the average user.

You need something that uniquely identifies "A" and "B", and helpfully there's the MAC address of the network card. It is possible to alter this but requires a knowledgeable user.

This is the idea:

1. Your executable comes in two parts. The first part is just a small stub which the user invokes. This second part is opened in memory, decrypted and executed by the stub (don't save the decrypted program to disk).

2. The key to decrypt consists of the MAC address and a salt.

3. Users give you their MAC address, or you have a small app to to get the MAC address and send it to you.

4. You create encrypted part and send it to user with stub - the MAC address is not stored anywhere.

Weaknesses:

• User spoofs MAC address
• User hacks stub to use a different MAC address
• User decrypts main program because they find salt value and decryption algorithm
• User copies executable from memory

Additionally, if the decryption fails then you can switch to a demo version that is packaged with the encrypted version.

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I used ExeShield in the past. Wasn't great and won't protect your software from determined hackers but good enough for low-volume software.