Access/User Model---The access/user model determines how the book is available to patrons, how many patrons can view ebook at once.

Adobe Digital Editions---(abbreviated ADE) is an ebook reader software program from Adobe Systems. It is used for managing and reading ebooks, digital newspapers, and other digital publications. The software supports EPUB and PDF (nonproprietary file format for reflowable text, or fixed layout ebooks; respectively). It implements a proprietary scheme of digital rights management (DRM) which allows document sharing among multiple devices and user authentication via an Adobe ID. 

DRM---Digital Rights Management (DRM) is technology that controls access to, tracks, and limits uses of digital works.  For ebooks it typically limits downloading, printing, or saving.

DRM-free---No limitations on downloading, printing, or saving 

1 User---(1 copy) One user at a time 

3 User---(3 copies) Three simultaneous users at a time 

Concurrent Access---200-325 loans per year; unlimited simultaneous users (EBSCO)

Non-Linear Lending---200-325 loans per year; unlimited simultaneous users (ProQuest)

Multiple User---Unlimited number of users (Elsevier/ScienceDirect)

Unlimited---Unlimited number of users 

PDF---Portable Document Format. PDF is a file format that provides an electronic image of text or text and graphics that looks like a printed document and can be viewed, printed, and electronically transmitted. To read a PDF on your device, a PDF reader is required. 

E-Pub---Electronic Publication. An ebook file format supported by many e-readers and compatible software is available for most smartphones, tablets, and computers.

Platform---The vendor who provides ebook access.

Overdrive---OverDrive is a free service offered by some libraries, such as the Buffalo and Erie County Public Library (BECPL), that lets you borrow digital content (like ebooks and audiobooks) anytime, anywhere.  **This service is not currently offered by University at Buffalo Libraries.