ProQuest allows patrons to use an e-book with limited licenses to have 5 minutes of access even if no license is available. I would suggest that such users get a notification that they have "limited" access to the book and a count-down click to show them the remaining access. If a license becomes available during those 5 minutes, a pop-up window can appear to inform them that they now have full access. If the five minutes are up, the patron should have the option to enter an e-mail or cell phone number to receive notification when a license becomes available. Thanks for considering.