Patent and Trademark
US PAT No. 6,981,700 was filed on 3 October 2003, and granted on 3 January 2006. Omar Syed also holds a trademark on the name "Arimaa".
Syed has stated that he does not intend to restrict noncommercial use and has released a license called "The Arimaa Public License" with the declared intent to "make Arimaa as much of a public domain game as possible while still protecting its commercial usage". Items covered by the license are the patent and the trademark.
Read more about this topic: Arimaa
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