On 06/02/15 03:30, Eriberto wrote: > IMHO you can use GPL-2, considering 1999-2002 (or nearly) as upstream date. Also, if no version of the GPL is specified, you are free to choose any version. From section 9 of the GPL-2: "If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation."