Article from 2014, which looks at people engaging in digital book piracy not as thieves but as modern-day librarians or collectors, who are focused more on preservation than providing easy access to the materials. Mainly, the authors write about various online libraries and how they're organized, with a small amount of technical details.

I found it a somewhat interesting article, but I'd hoped they'd go a little more into the ethics of it, and also give more of a view from the perspective of the various stakeholders they mention (publishers, authors, etc.).