A.Dig.Editions 4.5 Question: Will the books take up space on my hard drive?

Hello,

I want to understand the full functionality of Adobe Digital Editions. I only downloaded it because I was required to in order to borrow electronic books from

http://ebookcentral.proquest.com.library.sheridanc.on.ca/lib/sheridanc-ebooks/search.action

The above link cannot be accessed because you are required to be a student but I have made screenshots.

Please tell me what this exactly means:

image 1:

image2: (after downloaded adobe digital editions)

My Question:

I understand that this may be a silly question but I have very limited space on my hard drive. I would like to know if these books will take up space on my hard drive. If I have the book borrowed for 14 days; after 14 days it becomes inaccessible;

So the following comes up when I 'open' a new book that has been downloaded:

I want to know what is going on when it says "downloading content".

I plan to download or borrow many books 3 months from now for research but I want to know how to properly delete them if I have to in order to get my hard drive space back.

All responses are appreciated

Take Care,