Always-on DRM or always-online DRM is a form of DRM that requires a consumer to remain connected to a server, especially through an internet connection, to use a particular product. The practice is also referred to as persistent online authentication. The technique is meant to prevent copyright infringement of software. Like other DRM methods, always-on DRM has proven controversial, mainly because it has failed to stop pirates from illegally using the product, while causing severe inconvenience to people who bought the product legally due to the single point of failure it inherently introduces.