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Last Updated: Sep 17, 2013 01:09AM CEST
While the main content of the books will always be freely available, we plan to make some premium features available on subscription. This might include exercises for each chapter, or some multimedia content. Access to the forum associated with a book will also be limited to subscribers. Subscribers will also have the ability to add personal highlights and their own notes to individual sections of a book.

Some books will also be available in print, and these will be sold via Amazon.

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