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security - How to prevent others from using my .Net assembly?

I have an assembly which should not be used by any application other than the designated executable. Please give me some instructions to do so.

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You can sign the assembly and the executable with the same key and then put a check in the constructor of the classes you want to protect:

public class NotForAnyoneElse {
  public NotForAnyoneElse() {
    if (typeof(NotForAnyoneElse).Assembly.GetName().GetPublicKeyToken() != Assembly.GetEntryAssembly().GetName().GetPublicKeyToken()) {
      throw new SomeException(...);
    }
  }
}

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