If the cost is prohibitive, consider these legitimate free or open-source obfuscators:
Keep in mind that free tools generally offer weaker protection than commercial solutions like Eazfuscator.NET or SmartAssembly.
The term "exclusive license key" is misleading. Keys are:
Search results claiming to offer "exclusive" or "free" keys invariably lead to:
Eazfuscator.NET provides:
Unlike many competitors, it integrates directly into the Visual Studio build process with minimal configuration.