from 1991 until 2001, gpl enforcement was done informally, usually by stallman himself, often with assistance from fsf's lawyer, eben moglen. typically, gpl violations during this time were cleared up by short email exchanges between stallman and the violator. in the interest of promoting copyleft assertiveness by software companies to the level that the fsf was already doing, in 2004 harald welte launched gpl-violations.org.