When the project was started in 2001, all text in Wikipedia was covered by the GNU Free Documentation License (GFDL), a copyleft license permitting the redistribution, creation of derivative works, and commercial use of content while authors retain copyright of their work.[329] The GFDL was created for software manuals that come with free software programs licensed under the GPL. This made it a poor choice for a general reference work: for example, the GFDL requires the reprints of materials from Wikipedia to come with a full copy of the GFDL text.[330] In December 2002, the Creative Commons license was released; it was specifically designed for creative works in general, not just for software manuals. The Wikipedia project sought the switch to the Creative Commons.[331] Because the GFDL and Creative Commons were incompatible, in November 2008, following the request of the project, the Free Software Foundation (FSF) released a new version of the GFDL designed specifically to allow Wikipedia to relicense its content to CC BY-SA by August 1, 2009.[332] In April 2009, Wikipedia and its sister projects held a community-wide referendum which decided the switch in June 2009.[333][334][335][336]
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The GTAP Africa 2 Data Base includes data for 42 regions (32 African regions plus 10 other aggregated regions) and the 57 sectors of the GTAP 8.1 Data Base. New and updated I-O tables have been contributed with the help of African economists who were awarded scholarships to contribute this data and pursue research on African economic issues. The GTAP Africa 2 Data Base is packaged with the GTAPAgg aggregation software which is freely available for download after placing an order on the GTAP website. more info 2ff7e9595c
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