We support PDF and EPUB ebook formats. Most of our ebooks are PDF. PDF ebooks are typically displayed with AcrobatReader, a free PDF reader provided by Adobe, or a number of other PDF viewers.
PDF: This is an unprotected unencrypted PDF. We prefer this format because it gives you the largest amount of flexibility. You can print these ebooks and you can back them up as often as you wish. Please do not abuse this freedom to make copies for your friends or worse, sell these copies.
PDF_facsimile: This is an unprotected unencrypted PDF, like the PDF format above, but it was created differently. A PDF_facsimile ebook is a scan (image) of each page of the original book plus searchable text invisible behind these page images. The ebook preserves the look of the original book (typically an old out of print book or journal) but still allows you to perform a full text search. We use this format primarily for old journals to preserve some of their charm. The resulting files can get quite large.
EPUB: This is an ebook format. Essentially it is HTML compressed in a zip file. While it is a fairly popular and supported format we and most our customers prefer PDF.
JPEG: This is an image format. Very few of our products are purely a collection of JPEGs.
MP3: This is an audio format you can play back on your computer, your iPod or any other MP3 player.
MP4: This is a video format that has become a very popular standard and it is supported by pretty much all platforms.
These ebook formats can sometimes come in bundles as in PDF & EPUB. This means that you will get both a PDF version and a EPUB version of the same ebook. The ebook format is followed by either 'by download' or 'on disc', the former indicating that you download these ebooks and the latter that you will receive a disc with the ebook on it.