title: Gatekeeper signing for OSX DMGs outside of OSX/XCode/Mac App Store?
body: <p>From looking at notes for the upcoming OSX version (the one after OSX Lion), it appears that all DMGs/installers need to be signed, even if not distributed via the Mac App store.</p>
  
  <p>I couldn't find a command-line tool to do this signing though, or much documentation about obtaining a signing cert without submitting to the App Store.</p>
  
  <p>Can someone shed light on:
  1) How to obtain a certificate without distributing you app via the Mac App Store?
  2) How to sign a DMG without using built-in XCode tools (preferable a cross-platform tool)?</p>
  
  <p>Thanks!</p>