Z:gnu-www-ja-not-ipr--9630e0-For instance, copyright law wa/en

For instance, copyright law was designed to promote authorship and art, and covers the details of expression of a work. Patent law was intended to promote the publication of useful ideas, at the price of giving the one who publishes an idea a temporary monopoly over it&mdash;a price that may be worth paying in some fields and not in others.