The ThoutReader, which is distributed at no charge at www.OSoft.com, is an open source cross-platform publishing system that makes it easy for e-book readers to browse, search, bookmark, and append content in electronic form, and allows publishers to offer rights-managed versions of their books for sale on the OSoft.com web site. Unlike other e-book systems, ThoutReader registration is simple and convenient and does not require the user to log-in or be online every time they wish to use the content. There are no limitations on the number of computers on which a user may view their purchased content