The Formats I Provide for Educational Purposes
I think that teaching and education require essential freedoms to share information for intellectual and spiritual growth. For this reason, whenever I am making educational material available, I will NEVER EVER use proprietary formats such as Microsoft Office formats either in the old (DOC, PPS, XLS) or the new OOXML (DOCX, XLSX, PPSX). I actively campaign against the use of these formats which seriously harm the dynamics of education in schools and universities.
All the formats used to distribute my materials are free and open standards. Due to the fact that these material are functional, and may serve for other people's needs, I publish them under licenses which fall under the Free Cultural Works and Open Knowledge definitions. You may use them, study them, reproduce them, modify them, for commercial or non-commercial purposes, just as long as you follow the terms of the licenses.
Just know that these works are copylefted, which means that if you modify these works and make them available to others, you have to make them available under that same license or an equivalent.
To make these works as compatible as possible with other copylefted free material, I shall release them under three different licenses: Creative Commons Attribution-ShareAlike, the GNU Free Documentation License, and the GNU General Public License.
Programs to Read and Modify my Educational Works
For ethical reasons, I do not promote the use of proprietary software, this is, programs which restrict the user's freedom to copy, study, or modify them. In this page, I provide you a list of free programs you can use to read the eBook formats I provide.
To Read Web Version
To read the web version of my books, you need any web browser, nothing else. Usually people use Internet Explorer if they have Windows, or Safari if they have a Mac, or may have Opera. Also Google has released Chrome, which is built on top of the free/open source version Chromium. I invite you to use these free/open-source browsers.
To Read PDF Files
Microsoft Windows Users: SumatraPDF
MacOS Users: Skim
To Read DjVu Files
To view documents in DjVu format, you will need to download one of the following programs depending on your operative system:
To Read and Modify Open Document Format (ODF) Files
Due to the corporate hostility Oracle has shown to both the free software and the open source communities, I will no longer recommend the use of Oracle's OpenOffice.org.
No DRM (Digital Restriction Managements)
I made a pledge not to distribute my educational works with Digital Restrictions Managements (DRM). This means that any material you get from me can be reproduced as many times as you wish, and may be modified to other formats.