title: Why can't I use one ssh key on more than one github repo?
body: <p>I've got a server which needs to be set up with the contents of two git repos which I host at github. I now want to add the ssh key of the server as deployment key to both the projects on github. </p>
  
  <p>Unfortunately I'm getting an error saying <code>Key is already in use</code>, which according to <a href="https://help.github.com/articles/error-key-already-in-use/" rel="noreferrer">this github page</a> is because I can't add a deploy key to more than one repo. </p>
  
  <p>I really wonder though; why is this a problem? Why can't one server have access to several repo's? What's the risk they're trying mitigate here?</p>