title: Can I combine private publishers and public subscribers?
body: <p>Is it possible to configure Google Cloud Pub/Sub so that you can have any number of anonymous subscribers to a topic reading messages while the content of the published messages is controlled by an authorized publisher with an account on Google Cloud?</p>
  
  <p>For example, let's say I'm building an application that publishes GOOG stock ticker price every second. I want anyone on the internet to be able to subscribe to my application to get the stock price. However, no applications except my own should be allowed to publish the price. I need to understand if this is possible.</p>