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In academic publishing, an embargo is a period during which access to academic journals is not allowed to users who have not paid for access (or have access through their institution). The purpose of this is to protect the revenue of the publisher, although there is no evidence to date that shows that shorter or no embargo periods harm publishers. Various types exist: * A 'moving wall' is a fixed period of months or years. * A fixed date is a particular time point that does not change. * A current year (or other period) is setting a time point on Jan. 1 of the current year, so that all material earlier than that is available. Although fixed during the year, it will change each year. == Purpose == There are various purposes: * For delayed open access journals, the embargo separates the most recent period, for which a subscription is needed, from an older period, where a subscription is not needed and anyone may access the article. This can range from a few months to several years. * For self-archiving, the embargo is a period of time set by the publisher in the copyright transfer agreement where access to the archived version of the article in a digital repository is restricted until the embargo period expires. Typical embargo periods range from 6 to 24 months, though some publishers may require an embargo of up to 48 months. * In full-text databases, such as those of EBSCO Publishing or ProQuest, it separates the most recent period, where only a title or abstract is available, from an older one, which is openly accessible. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Embargo (academic publishing)」の詳細全文を読む スポンサード リンク
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