How to read books purchased from iTunes on Mac?

I purchased a script through itunes. But here we go, I need it and anti-piracy stuff is getting in the way. I'm used to figuring out ways around this type of stuff but this is driving me MAD!

I PAID for this book (which is more than I usually do, I admit) and I seriously need it for a project. How do I get around this DRM ***?

I only have a computer, no iPad or iPhone. (My mobile phone is still from 2007)
I tried requiem. I can't get it to run…
I tried Adobe Reader… I only get white blank pages

I have itunes 11.0.1 (I can downgrade though)
My mac is 10.6.8

Added (1). Filetype of book is.epub

What filetype is it?

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