[chefandy]

Case law is public domain. You can publish digitized copies of Westlaw books with the headnotes, keys, and a couple of other property bits redacted. Any of their proprietary elements though, definitely including the key cites, are clearly a no-go. The headnotes not only require creativity and expertise to make, many lawyers consider them indispensable (though many other lawyers apparently throw shade at lawyers that rely on them.) And since most of the rest of the book is public domain, it’s one of the biggest, if not the biggest selling point for their texts. They famously vigorously defend their copyrights— the defendant surely knew what they were signing up for when they started doing this.