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http://www.fsf.org/bulletin/2007/fall/antifeatures/

This article talks about antifeatures. Antifeatures, as defined in this article, is functionality that a technology developer will charge users to not include. One such example is with Windows NT Server versus Windows NT Workstation. Essentially, they are both the same program. However, Windows NT Workstation had many of those features disabled during installation when certain flags went up that the installation was for Workstation and not Server. In some cases, users can pay to have these features turned off. In other cases, they cannot.