What is the difference between the first free eChapter (and TOC) and the eChapters for sale?
The first eChapter of each book (in some cases this is eChapter 0 or eChapter P (preview eChapter), and the table of contents are pdf files. These items are included free to provide users the opportunity to review the content in a digital format. You do not need to download the unsealer to view these items. However, you must register to view a free eChapter or a table of contents. Also, purchased eChapters show up in MyStuff but the free eChapter(s) you viewed will not.