Luminair uses Apple's standard App Store license, which for personal use allow you to install it on all of the devices connected to your personal iTunes account. For business/commercial use, any time an app is going to be used on multiple devices with multiple users, each device needs to have a separately purchased copy installed (purchased through separate Apple accounts). This is covered in section 'ii' under "App Store Product usage Rules" at the following link. (I've also linked to the EULA)
http://www.apple.com/legal/internet-services/itunes/us/terms.html
http://www.apple.com/legal/internet-services/itunes/appstore/dev/stdeula/