Hi Alexander -- on Oct 29 2018 at 10:29, you wrote:

AK> What is a format these books are made? Theoretically, it should be a
AK> dot-matrix, raster format.

I can't speak to that aspect, but there are several widely-accepted formats in
use:

EPUB
The ePub format is an open format designed by the Open eBook Forum and
developed by the International Digital Publishing Forum. Based on XHTML and
XML.

AZW
This is an Amazon format used exclusively on the Amazon Kindle. It is basically
a MOBI format that uses a high compression option.

LIT
This is an e-book format developed for the Microsoft Reader software.

PDF
The Portable Document Format was created by Adobe for its Acrobat products.

ODF
OpenDocument Format, XML-based file format, which is the default format for
OpenOffice, an open source productivity suite that is becoming a popular
alternative to Microsoft Office.

MOBI
The e-book format used by the MobiPocket Reader


Cheers... Dallas

--- timEd/NT 1.30+