When should you protect a strong name key file with a password?

In the visual studio project settings you can choose a strong name key file for signing the assembly. When creating a new one you can choose to protect it with a password. When should you do this? And when should you not?

I am thinking that it could for example be not so smart to protect it with a password if the project is an 开发者_StackOverflowopen source project hosted on Codeplex or similar. Or should it still be protected? Will people be unable to download the source and compile it if the key file is protected? Or, how does this work exactly?

In general, you should protect it with a password if you don't trust the people with access to it. Anyone with access to the key file can create an assembly with your strong name (unlike authenticode, they're not impersonating you, but they can get their assemblies to load instead of yours)

As for the open source scenario you described, people can always compile the code - they simply create a new key file, but the assemblies they create will not be loaded by assemblies that try to load your assemblies.