Introductory video

An Animated Introduction to PDA Models

E-BASS25 is proud to present an introductory animated video, which explains the various models available to libraries and library consortia regarding patron-driven acquisition of e-books.

The video can be viewed from the project blog:

It is also available on the M25 Consortium YouTube page:
Creative Commons License
E-BASS25 Patron-Driven Acquisition (PDA) e-book purchasing models by E-BASS25 is licensed under a Creative Commons Attribution-NoDerivs 3.0 Unported License.
Based on a work at

This document contains the script for the video, illustrated by some of the images.