i like answering questions with tips to help you get around limitations
device limit loophole
by rigor mortis
if any of your devices are computers there is a 5 computer limit
as long as a "computer" does not have any kind of DRM media - like if every single song on that computers iTunes library is iTunes plus , you don't even need that computer signed onto iTunes at all. once you play music or watch a movie you purchased you have to sign on. but as long as you don't play anything that has DRM then you don't need to sign it on
the will free up a slot
iTunes has 2 ways to share music
the old way will not let you stream to an ios device, but you can stream to any client you want and those clients don't need to be signed onto iTunes.
clicking on iTunes
clicking on preferences
click on sharing
share my music on my local network
the new way lets you stream music to iOS devices like the apple tv and your iPhone, but it requires one of your activations.
that one is click on file
click on hone sharing
its a shame that some people think the old way is the legacy way and don't think anyone uses it anymore, when it has some serious advantages over the new way
you can use both sharing methods at the same time
if you have a lot of purchased music from iTunes you can have apple remove the drm by upgrading the songs by using iTunes match ( or now called itunes in the cloud ) for $25 a year, and once you cancel iTunes match, you get to keep all the music that has been upgraded to iTunes plus