The Simputer General Public License, or the SGPL is a free content hardware distribution license drafted specifically for the purpose of distributing Simputers. As a license it has been loosely modeled on the GPL but in substance it is very different. The Simputers manufactured under the SGPL are required to be certified by the Simputer Trust before they are allowed to be sold under the Simputer trademark. In order to be so certified they must fulfill the Core Simputer Specifications as disclosed on the simputer website.