Can I authorize Serato Video on a second computer, or must I obtain a second license?

The license agreement for Serato Video states that it can only be used on one computer at a time. If you want to use Serato Video on a secondary (backup) system as well, but not simultaneously, a second installation is included in your license provided you are not running it at the same time as your main system. 

Activating and running Serato Video on more than one machine simultaneously is a violation of the license agreement and will result in the permanent de-activation of your serial number.