When I signed out and signed in with his ID, none of my previous purchases even show up.
When we go to his iTunes account, under Store > Manage Devices it lists all the devices associated with his ID, including this computer - next to which it says 'Associated February 4, 2013 - 86 days remaining.' (The last time he synced his iPad with this computer for updates and such....)
Above that is the following paragraph:
"These computer and devices are associated with your Apple ID for Automatic Downloads or to download previously purchased music, apps, and books. Computers and devices can be associated with a different Apple ID once every 90 days. Days remaining indicates the number of days before you can associate that specific computer or device with a different Apple ID."
This is where support sent me the first time with my login, and this computer was not listed under my login even though when I am logged into my iTunes account (whichever user) and I try to authorize this computer, it tells me it is already authorized.
I am creating another user, but I expect that when we login to iTunes on the new user using my existing iTunes account so that I can access my content, the result will be the same....but I'm willing to try....