All ebooks can be downloaded
Publishers may place restrictions on ebooks which prevent them from being downloaded. Sometimes they allow the whole book to be downloaded and other times you are limited to a certain number of pages.
You need an e-reader to view ebooks
Ebooks can be viewed on iPads, smartphones, computers, tablets, or other devices which have the appropriate software.
All ebooks can be printed
Publishers can limit the number of pages printed from an ebook.
Example: Most ebooks in Ebrary allow a maximum of 60 pages printed per day. Some publishers though, have set a more restrictive printing limit for their books in Ebrary.