As a lawyer, I can chime in here. Annotated statutes are special. They have cross references to the cases which cite to the statutes. So if you're doing research on a statute, the annotated version will have the letter of the law word for word, then at the bottom it will have a little topical index (with topics based on a part of the statute) under each topic will be the cases citation which addressed that topic and a brief 1-2 line description of what that case held. Generally, one of the publishers puts them together instead of the state because it takes a lot of legwork and constant updating as new cases interpret the statute. State laws and statutes are obviously not something you can claim is your intellectual property but when they're annotated you are actually reading a lot of stuff that isn't the just the statute.