and children books.

The same year, the Acrobat Reader was available for PDAs,
beginning with the Palm Pilot (May 2001) and the Pocket PC
(December 2001).

Between 1993 and 2003, over 500 million copies of Acrobat
Reader were downloaded worldwide. In 2003, Acrobat Reader was
available in many languages and for many platforms (Windows,
Mac, Linux, Palm OS, Pocket PC, Symbian OS, etc.).
Approximately 10% of the documents on the internet were
available in PDF.

In May 2003, Acrobat Reader (5th version) merged with Acrobat
eBook Reader (2nd version) to become Adobe Reader (starting
with version 6), which could read both standard PDF files and
secure PDF files of copyrighted books.

In late 2003, Adobe opened its own online bookstore, the
Digital Media Store, with titles in PDF format from major
publishers (HarperCollins, Random House, Simon & Schuster,
etc.) as well as electronic versions of newspapers and
magazines like The New York Times, Popular Science, etc. Adobe
also launched Adobe eBooks Central as a service to read,
publish, sell and lend ebooks, and Adobe eBook Library as a
prototype digital library.

= Open eBook and ePub

In 1999, there were nearly as many ebook formats as ebooks,
with each new company creating its own format for its own ebook
reader (software) and its own electronic device, for example
the Glassbook Reader, the Peanut Reader, the Rocket eBook
Reader (for the Rocket eBook), the Franklin Reader (for the
eBookMan), the Cytale ebook reader (for the Cybook), the
Gemstar eBook Reader (for the Gemstar eBook), the Palm Reader
(for the Palm Pilot), etc.

The digital publishing industry felt the need to work on a
common format for ebooks. It released in September 1999 the
first version of the Open eBook (OeB) format, based on XML
(eXtensible Markup Language) and defined by the Open eBook
Publication Structure (OeBPS). The Open eBook Forum was created
in January 2000 to develop the OeB format and OeBPS
specifications. Since 2000, most ebook formats were derived
from - or are compatible with the OeB format, for example the
PRC format from Mobipocket or the LIT format from Microsoft.

In April 2005, the Open eBook Forum became the International
Digital Publishing Forum (IDPF). The OeB format was replaced
with the ePub format, a global standard for ebooks with PDF.
The PDF files created with recent versions of Adobe Acrobat are
compatible with the ePub format.

= Microsoft Reader

Micro