Publishing rules give you complete control over your content by enabling you to control where and when it can be viewed.
Publishing rules enable you to:
For example, a user in country X spoofs his IP address through a VPN/proxy to look like he's in country Y to accesses content only permitted in country Y. You can set up anonymous proxy controls to restrict this user from viewing your content.
For example, if you allow content to be viewed from 1:00 to 4:00 from the New York time zone (GMT -05:00), the content will be accessible around the world (in geographic regions that you allow) from 6:00 to 9:00 GMT.
You can use any combination of publishing rules to meet your requirements. For example, you might want to only allow your content to be viewed in the United States, between 6:00 PM and 11:00 PM, on non-iOS devices.