The authors of traditional printed materials sell exclusive territorial intellectual property rights that match the list of countries in which distribution is proposed (i.e. the rights match the legal systems under which copyright protections can be enforced). In the case of books, the publisher and writer must also agree on the intended formats of publication - mass-market paperback, "trade" paperback and hardback are the most common options.
 
 The situation is slightly more complex if electronic formatting is to be used. Where distribution is to be by CD-ROM or other physical media, there is no reason to treat this form differently from a paper format, and a national copyright is an acceptable approach. But the possibility of Internet download without the ability to restrict physical distribution within national boundaries presents legal problems that are usually solved by selling language or translation rights rather than national rights. Thus, Internet access across the European Union is relatively open because of the laws forbidding discrimination based on nationality, but the fact of publication in, say, France, limits the target market to those who read French.