And while I know it was very convenient to get a set of books on CD, and the product line was quite successful, we had an awful lot of cloning going on, with duplicate copies sold on eBay and other sites, as well as posted on public internet servers. While we're not big on copy protection, and recognize that "piracy" can have beneficial effects on some products (see my essay, Piracy is Progressive Taxation), we believe that Safari offers a better blend of convenience for the user and revenue-generation for our authors.