Adobe Digital Editions for a college Library

Hello,

I have bought some eBooks for our Library which require Adobe Digital Editions. If I download the ADE it can only work on six designated computers. I can see that there K-12 schools can get a version which allows all students and teachers in the school to use the eBooks. I can see that it's also available for public libraries so that their members can borrow eBooks. How do I go about getting a version which would allow students and teachers to access eBooks at college on our computers and their own devices plus accessing in their own homes?