I might be misunderstanding the scheme, but that sounds like someone would just need to automate viewing of consecutive sections in live view as it would unblur each section until you've downloaded the whole book. What am I missing?
They also sell their eBooks as normal PDFs (no DRM).
I assume it’s a healthy combination of making high quality technical publications easy to acquire at a reasonable price. Similar to how digital movie and music piracy finally died down when that media became reasonably easy to acquire legally.