There are large differences between countries with regard to copyright laws. Of particular concern to CPT are national policies on fair use. Many persons participate in Internet news groups and mailing lists, often redistributing portions of or even entire articles of selected stories in discussions of a wide range of topics. Teachers circulate information in classrooms for non-commercial use, including, for example, foreign video clips or articles from foreign web sites. NGOs and individuals provide hypertext links to articles from other web pages.
Authors quote from other authors.
Stories, books and movies explore ideas or themes used or developed earlier by others. Musicians sample music, or in various ways borrow or use from others. Software, telecommunications and computer engineers, pharmaceutical companies, automobile manufacturers and others use reverse engineering to understand how machines, software, drugs and other products are made, or how they can make interoperable products. Some of these activities are considered infringements, and others are considered fair use under various national legal systems. By including copyright infringement claims in the Hague Convention on foreign judgments, every author, every software developer, every musician, every student, and every citizen who uses or receives information, will have liability for foreign copyright laws.