FAQ

What do I need to view the e-books?

You first need to unzip the .zip file you have downloaded. Recent versions of Windows and Mac OS come with built-in zip extraction programs. If this is not your case, you can download free versions here:

The next step is to open your e-book with a program that can read the .pdf file you have extracted from the zip file. You can download the lastest version here:

What is the copyright status of the books available for download?

All of the free e-books available on Knowledge Files belong to public domain.

1. Anything prior to 1922 inclusive (i.e. published in 1922 or prior to 1922) is in the public domain.

2. Anything published in the US between 1923 (inclusive) and 1963 (inclusive) is in the public domain if it was not renewed at the US copyright office 28 years after the date of publication.

We always verify the copyright status of a title before making it available for download. If you find a document which is not of public domain, please contact us and we will promptly remove it from the site.

Is this site trying to promote a particular philosophy/religion/cult?

Knowledge Files is dedicated to archiving research documents originating from many schools of thoughts, without promoting or condemning any of them. We wish Knowledge Files to be a site where classic texts can be discussed in a tolerant, open-minded and respectful matter.