Thanks for getting in touch Brian. You don’t technically need to have a license key on each site, as long as you have one on the main site. That will give you access to support and updates. However, without a license key on the other sites you will likely need to manually download and install updates for those sites. Honestly, I’m not sure if the network activation will make a difference there or not. If manually updating would be problematic for you, then you’d want to buy a larger license package. Does that answer your question?
Best,
Leah