IIRC, authors are usually not supposed to release the final version for a while due to some legal complications even if their publisher agrees with the idea its

IIRC, authors are usually not supposed to release the final version for a while due to some legal complications even if their publisher agrees with the idea itself. One of the workaround is releasing a draft version of the book, nearly identical to the final version. If this is the case, the book can be practically considered public.