Everything in this database was purchased by the LSC Libraries (not just UP). Access depends on how many copies were purchased and/or how many uses each title is licensed for, which is set by the publishers.
When you click into a book record in Ebook Centeal, an "Availability" statement is shown before the summary. Because nearly all these books are part of the subscription package, you can expect to see a statement of unlimited user access.
Below that will be lines letting you know how many pages of the book you can download as pdf and print.
Newly-acquired e-books selected by the LSC-UP librarians: