The real problem is, even with the effort to use a 'password' from teh books themselves, it isn't sanctioned by WotC (or the other companies that may or may not have been involved), and thus it's still a breach of copyright.
Even if you were to find a way to 100% prove they owned the book - where going to the store & reading it, or emailing the code around couldn't happen - then it's still a crime to distribute it, unless given premission by the copyright holder.
For the same reason it's illegal to download the PDF of a book, even if you own it - the publisher could (adn often does) sell the PDF copy on it's own, then yor're taking tha that ability away from them. WotC (and others) have chosen to make the data/character generation capability of their books available in specific formats, and it's a illegal to distribute it in another format, or in that 'sanctioned' format without compensation to teh copyright holder. (It's illegal regardless of whether or not a publisher sell the product in that format, but in the PDF example & the DMGenie case, the original holder happens to.)
Even if you were to find a way to 100% prove they owned the book - where going to the store & reading it, or emailing the code around couldn't happen - then it's still a crime to distribute it, unless given premission by the copyright holder.
For the same reason it's illegal to download the PDF of a book, even if you own it - the publisher could (adn often does) sell the PDF copy on it's own, then yor're taking tha that ability away from them. WotC (and others) have chosen to make the data/character generation capability of their books available in specific formats, and it's a illegal to distribute it in another format, or in that 'sanctioned' format without compensation to teh copyright holder. (It's illegal regardless of whether or not a publisher sell the product in that format, but in the PDF example & the DMGenie case, the original holder happens to.)