From book's page:

Introductory Physics I -- Mechanics is provided for the benefit of all students or teachers of physics, at Duke or elsewhere for their personal use and for the exclusive purpose of teaching or learning physics. This textbook may not be printed and sold for a profit without the permission of the author. This textbook may not be electronically redistributed without the permission of the author.

License info:

The documents linked from this page are all provided under a modified Gnu License appropriate for the document type (OPL for text, GPL for software/source). Please read the relevant license(s) before redistributing the document(s) in any form -- an explicit agreement with the author is required for certain kinds of for-profit redistributions. In all cases the license makes the documents generally available for unlimited personal use and non-profit distributions (for example, linking or posting copies on a website, distributing paper copies to a class for free or at cost).

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