Martin’s book is available in PDF format online due to the way he views information and knowledge. He doesn’t want this type of information to be reserved for certain people or organizations, rather, it should be available to everyone so they can pursue their acquisition of knowledge. Through this, knowledge will be able to evolve and change based on our needs at the time; knowledge shouldn’t become stagnant and kept from the public.
Its availability online further exemplifies his ideals as it is being made available to all without the need to pay, which many people may not be able to do, or be a part of some type of organization which can obviously afford to pay the entry point.