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A number of educational institutions are using the material in computer-equipped classrooms, and for that purpose, lab-packs of DVDs can be prepared for your institution. Email the author for details. Another possibility is an internal license to post HyperPhysics on an internal site, which would permit you to modify and add to it as a base. Such licenses are subject to the restriction that the internal mirror site must be at least password-protected from the world wide web. Such licenses are being used by a number of educational institutions and training centers to facilitate the development of specific content without having to "reinvent the wheel" by filling in all the introductory material.