Copyright Clearance Center - This organization provides a mechanism to properly license the right to use copyrighted materials.
Her Majesty's Stationery Office's guidelines on Crown Copyright - The government of the United Kingdom retains copyright on most government documents. This can be compared to the position taken by the United States government, which does not copyright most federal publications.
Primary Sources on Copyright, 1450 -1900 - A history of copyright (from the invention of the printing press) in Renaissance Italy, France, German-speaking countries, Britain, and the USA.
The United Nations Educational, Scientific, and Cultural Organization (UNESCO) provides copyright laws of UNESCO member states here.