Far copyleft is a term used in the copyleft trend, for referncing practices that are higherly viral than the ones estated by the gnu project's initial definition work or derivates from it such as the creativecommons Share alike clausule
Far copyleft intends to mean further freedom than the already standarized by the most popular referents. Examples of far copyleft applied to works for sharing may vary: Some would say that prohibitng militar uses of a copylefted work (sluc.info) or the creator endorsed mark are far copyleft initiatives. However, on the top all these, other people may argue that the copyleft requirement is alreday non free due to the viral obligation.
There's just one and nasty mention on wikipedia about far copyleft, identifying sofisticated vandalism and destructive vanguardists with the far copyleft trend.