title: Is Microsoft the only one that can write trusted unsafe code?
body: <p>I would like to write some unsafe C# code for the purpose of writing high-performance, low-level libraries.</p>
  <p>But I don't quite understand the limitations of where that code can run.</p>
  <p>Microsoft obviously writes libraries that use unsafe code, which are fully trusted. Is Microsoft the only one who can do that?</p>