Classic trouble loading textbook

[lone horse]

Hi everyone-
I recently purchased a textbook that I need that was available as an e-book. I am having trouble getting it onto my nook. It downloaded as a "sealed Acrobat document". Now, the files are now showing as SPDF files. I have tried making a textbook folder in my documents. I have tried just putting the files(there are 47, individual chapters) straight into the my documents folder with no sub-folder. I tried opening it with ADE. No luck. What am I doing wrong?

I found a spot on the book publisher's website that the book is not able to be used on screen reader devices like the iPad or Kindle(of course, after I bought it). Does this mean it won't work? grr.
Thanks for all the help!!