Canon Policy
The question of canon is a complex one and has plagued fans since Star Trek began in 1966. The general policy of Paramount Pictures is that anything outside live-action television episodes and movies is apocryphal, or non-canon. However, grey areas in this policy, especially in relation to the canonical status of Star Trek: The Animated Series (TAS), further complicate the matter and have led to many debates among fans. In light of this, Memory Alpha crafted its own unique definition of canon in relation to what may be used as a "valid resource". The Animated Series is included as valid, or canonical, for a number of reasons, such as the fact that Star Trek creator Gene Roddenberry and most of the cast of the original series were involved with it and the existence of several references to TAS events in later series.
Information taken from the Star Trek Encyclopedia and Star Trek Chronology is mostly accepted on Memory Alpha as well, to the extent that it does not break from established on-screen facts. Content from these sources is an acknowledged grey area of Memory Alpha's canon policy and is disregarded if deemed speculative or contradictory. Thus, in some ways they hold the same weight as novels and other publications do for Star Wars canon: a "second tier" of canonicity, which is subservient to primary (on-screen) sources.
Other sources such as books and computer games are not included as canon, but are covered by Memory Alpha in a way which sets it apart from other Trek resources: books, comics, and other products are included as articles about the products (i.e. from a "production point of view"), but "in-universe" information unique or new to them is covered on the product page. For example, in the Star Trek: New Frontier line of books, a new host of characters is introduced to the Trek universe, and their vessel is known as the USS Excalibur. The characters, ships and information from New Frontier books do not receive pages of their own, but they are covered on the pages about the books. In this way, Memory Alpha remains all-inclusive while attempting to distinguish canon from apocrypha.
Non-canon characters and topics are instead covered at Memory Beta, and fan-films and other fan-created material at Star Trek Expanded Universe; both are hosted by Wikia. The Star Trek Online Wiki, hosted by curse.com, covers the Star Trek Online MMORPG.
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