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
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ProQuest eBook Central
The print and copy allowances can be found in the Availability section of the book detail page
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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
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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.