Q: new computer won't access shared content

just bought a laptop for my daughter.  We are sharing content from the main computer itunes account with her computer and her itunes account.  can log in no problem, and see the content, however when movies are attempted to be played, her computer asks every time to log in to her account to authorize her computer.  This should only be happening once, however it happens every time she tries to watch content shared from the main computer in the house.  Help?