title: Google spreadsheet : different rights without identification
body: <p>I have a google docs spreadsheet. I want to share it with people that dont necessarily have a google account by just sending a URL.</p>
  
  <p>It's ok if everyone has the same rights but what if I want some people with read only and others with read and write rights ?</p>
  
  <p>Is it possible for instance to have two URLs :  one for read only and another for read and write ?</p>