They call it Founder's Copyright. The also use Creative Commons. The goal is to make out of print books available at no cost.
> Copyright-comment
> Scanned under the Creative Commons Founders' Copyright license, per Tim O'Reilly.
Yes, O'Reilly did, in fact, re-license the content for sharing:
https://www.oreilly.com/pub/pr/1042
They call it Founder's Copyright. The also use Creative Commons. The goal is to make out of print books available at no cost.