EBL books have eblib in the url:
"Non-Linear Lending ™ provides multiple concurrent accesses to content, according to librarian settings. Each "copy" of an ebook that a library purchases via Non-Linear Lending ™ allows up to 325 loan instances per year. At the end of the lending year, these 325 loan instances automatically renew at no additional cost."
Textbook lending is the same as non-linear except that access is limited to 3 simultaneous users.
From EBL's Q&A
