Z:gnu-www-ja-copyright-and-globalization--5b7eac-Copyright in the age of the pr/en

Copyright in the age of the printing press was also easy to enforce because it had to be enforced only where there was a publisher, and publishers, by their nature, make themselves known. If you're trying to sell books, you've got to tell people where to come to buy them. You don't have to go into everybody's house to enforce copyright.