Because of digital rights management, you can copy or print around 5% of an ebook. This varies from publisher to publisher and book to book
EBSCO FE Subscription Collection
the print and copy allowances can be found near the bottom of the detailed record
ProQuest eBook Central
The print and copy allowances can be found in the Availability section of the book detail page
Some books have unlimited print, copy, & download. You can search for them by ticking the "unlimited print, copy, & download" box that appears on the left hand side of the search results page and the right hand side of the Advanced Search page
Note: The printing copying and chapter download allowance is per user per 24 hours. If you are allowed to print 77 pages, then that's 77 pages per 24 hours; you can do that today and print another 77 pages tomorrow - after 24 hours have passed.