There is now a PDF copy of Against Intellectual Property by N. Stephan Kinsella, in the eBooks section of the site.
This is a copy downloaded directly from the Mises Institute. In approximately 60 pages it provides a comprehensive overview of Patent and Trademark law. It is written from a libertarian perspective, and provides a lot of food for thought.
The Table of Contents is not clickable, but pages are numbered and its short length makes it easily navigable. This PDF file is in fact an EXACT duplicate of the printed book.
Update – 2020-04-26 — By the way, this book resulted in my own paradigm shift regarding IP. It may influence others as well.