Q about E-Books...

I would like to buy CFTS. My question is, how does it work with the e-books? can you download them only once on one computer?
because I would like to have one copy on my computer at home, but I would also like to have it here on my account at my university so that I can print it out for free. or can I just send the file per mail to myself? please let me know

You pay for the pdf - i think there is a time limit for downloading it but that is all. Once you have it there are no restrictions so you can print it off at university.