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| <span id="csdoc_access_level"></span>
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| Citations of online sources that require registration or a subscription are acceptable in Wikipedia as documented in [[WP:PAYWALL|Verifiability § Access to sources]]<!-- {{Section link|Wikipedia:Verifiability|Access to sources}} -->. As a courtesy to readers and other editors, editors should<!-- can --> signal restrictions on access to material provided via the external links included in a citation. These levels describe requirements or constraints related to accessing and viewing the cited material; they are not intended to indicate the ability to reuse, or the copyright status, of the material, since that status is not relevant to [[WP:V|verifying claims in articles]].
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| <!-- There are four access levels split between the url-holding parameters and the identifier parameters. -->Four access levels can be used:
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| *[[#Access indicator for named identifiers|access indicator for named identifiers]]:
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| ** [[File:Lock-green.svg|9px|link=|alt=Freely accessible|Freely accessible]] <code>free</code>: the source is free to read for anyone (from the viewpoint of the provider of the source – could still be blocked by client-side filtering or safeguarding, or distributor-based geoblocking<!-- to be distinguished from geoblocking by the provider of the source -->)
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| *[[#Access indicators for url-holding parameters|access indicators for url-holding parameters]]:
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| ** [[File:Lock-gray-alt-2.svg|9px|link=|alt=Free registration required|Free registration required]] <code>registration</code>: a free registration with the provider of the source is required to access the source, even if a limited preview, abstract or review may still be available without registration
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| ** [[File:Lock-gray-alt-2.svg|9px|link=|alt=Free access subject to limited trial, subscription normally required|Free access subject to limited trial, subscription normally required]] <code>limited</code>: there are other constraints (such as a cap on daily views, a restriction to certain day or night times, or providing the contents only to certain IP ranges/locales on behalf of the provider of the source<!-- to be distinguished from geoblocking by other parties -->) to freely access this source as a whole
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| ** [[File:Lock-red-alt-2.svg|9px|link=|alt=Paid subscription required|Paid subscription required]] <code>subscription</code>: the source as a whole is only accessible via a paid subscription with the provider of the source ("[[paywall]]"), even if a limited preview, abstract or review may still be available without subscription
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| As there are often multiple external links with different access levels in the same citation, each value is attributed to a specific external link.
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