American Opportunity tax credit - qualifying expense?

You'd think I'd have the hang of this after 3 years, but I'm still learning the nuances. I've read the IRS publication, and understand that room and board can't be used as qualifying expenses, but tuition, fees, and books can. After scholarships, my D's tuition and fees don't quite hit the magical $4000 mark needed for maximum credit. Her program requires few books, but does require Adobe Creative Cloud. Would the (expensive) subscription to Creative Cloud count as "books"? I need to figure it out pretty quickly so I can budget for "prepaying" Spring 2016 in December.