1) Microsoft Cardspace builds on the idea of claims . A “digital identity” is a set of claims made by one party about another party 2) Antarctica is owned by no country, but seven have made territorial claims over different (sometimes overlapping) pie-shaped sectors. 3) Argentina bases its claim in part on the Treaty of Tordesillas 4) The Treaty of Tordesillas was the 15th Century agreement between Portugal and Spain that divided up the globe into two domains - everything west of a mid-Atlantic meridian