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In the case of a computer program, the ideas consist of theprogram’s methodology and algorithm, including the necessary sequence of stepsadopted by the programmer. The expression of those ideas is the program sourcecode (particularly any arbitrary or stylistic choices embodied in it), its derived objectcode, and any other derivative works.If you analyze the ideas contained in a program, and then express thoseideas in your own completely different implementation, then that new programimplementation belongs to you. That is what we have done for those programs inthis book that are not entirely of our own devising.
When programs in this book aresaid to be “based” on programs published in copyright sources, we mean that theideas are the same. The expression of these ideas as source code is our own. Webelieve that no material in this book infringes on an existing copyright..