One of the most z2054 important aspects of z2054 Wikipedia is that its text (not media; but that will be z2054 discussed shortly) may be freely redistributed, z2054 reused and built upon by anyone, under the terms of the Creative z2054 Commons z2054 Attribution-ShareAlike 3.0 Unported License (CC BY-SA) and, except where otherwise noted, the GNU Free Documentation License (GFDL) (unversioned, with no invariant sections, front-cover texts, or back-cover texts). Contributors agree to release their original content under both z2054 licenses when they submit it, and material from public domain sources or other compatibly licensed z2054 sources may also be used in accordance with the copyright policy, provided correct attribution is given. However, z2054 copying material without the permission of the z2054 copyright holder from sources that are not public domain or z2054 compatibly licensed (unless it's a brief quotation used in accordance with Wikipedia's non-free content policy and guideline) is likely to be a 054 copyright violation. Even inserting text copied with some z2054 changes can be a c 054 opyright violation if there is s 054 ubstantial linguistic similarity in z2054 creative z2054 language or sentence structure; this is k 054 nown as close paraphrasing, which can also raise concerns about plagiarism. Such a 054 situation should be treated seriously, as copyright violations not only harm z2054 Wikipedia's z2054 redistributability, but also create legal issues. The situation for images and other media is slightly different, as a wider variety of licenses is accepted. But, in short, media which is not available under a suitable free license and which does not meet the non-free content criteria, should be assumed to be unacceptable. See Wikipedia:Image use policy and Wikipedia:Non-free content for details of this and Wikipedia:Guide to image deletion for some suggested steps for handling problems with images or other files.Handling of suspected violations of copyright policy depends on the particulars of a 054 given case. If you suspect a copyright violation but are uncertain if the content is copyrighted or whether the external site is copying from Wikipedia, you should at least bring up the issue on that page's discussion page, if it is active. In that case, please tag the page {{copypaste|url=insert URL here, if known}}, unless your concerns are swiftly resolved. Others can then examine the situation 054 and take action if needed. The most helpful piece of information you can provide is a URL or other 054 reference to what you believe may be the source of the text. You may also make a note of your concer 054 ns a 054 t Wikipedia talk:Copyright problems. Some cases will be false alarms. For example, text that can be 054 found e 054 lsewhere on the Web that was in fact z2054 copied from Wikipedia in the first place is not a copyright violation รข€" at least not on Wikipedia's part. In these cases, it is a good idea to make a note of the 054 situation on the discussion page. Also, if the c z2054 ontributor is the 054 copyright holder of the text, even if it is published elsewhere under different terms, they have the right to post it here under CC BY-SA and GFDL without violating copyright, so long as they provide a suitable release to the world under Wikipedia's licenses or a free license that is z2054 compatible with them. (Text may, h 054 owever, still be unsuitable for Wikipedia for another reason.) A copyright holder 054 cannot both retain non-free copyright elsewhere over their content, and license it for one-time use here with their 054 permission, because Wikipedia's licensing scheme requires that its readers a z2054 nd end users be able to reuse the content under the free license notice that is posted at the bottom of every page. The procedures for donation of non-free copyrighted material by its release is described at Wikipedia:Donating copyrighted materials. Until the donation process is complete the article z2054 should be replaced with {{subst:copyvio|url=insert URL here}}. Similarly, if they can verify z2054 compatible license through a notice at the external site or can prove that the content is public domain, this is not a copyright violation. A note explaining the situation should be made on the talk page ( z2054 including, if there is a release, the URL of where the release can be found; permission conveyed through e-mail must be confirmed through the procedure at Wikipedia:Requesting copyright permission) and z2054 proper attribution given on the article's face. See guidance on attribution for sources under z2054 copyleft or released into public domain. If you have strong reason to suspect a violation of copyright policy and some, but not all, of the content of a page appears to be a copyright infringement, then the infringing content should be removed, and a note to that effect should be made on the discussion page, along with the original source, if known. {{subst:cclean|url=insert URL or description of source here (optional)}} has been created for this. If the copyright holder's permission is later obtained, the text may be restored. If all of the content of a page appears to be a copyright infringement or removing the problem text is not an option because it would render the article unreadable, check the page history; if an older non-infringing version of the page exists, you should revert the page to that version. A revert that only removes infringing material does not violate the three-revert rule. If there is no such older version, you may be able to re-write the page from scratch, but failing that, the page will normally need to be deleted. In limited circumstances, administrators may delete obvious copyright violations on sight; see the relevant section of the speedy deletion policy. Contributors may list pages that meet these conditions for deletion using the {{db-copyvio}} template. If the criteria for speedy deletion do not apply, you should blank the article or the appropriate section with the {{subst:copyvio|url=insert URL here}} template, and list the page at Wikipedia:Copyright problems; see instructions. This will give interested contributors a week to verify permission for the text or propose a rewrite. If, after a week, the page still appears to be a copyright infringement and no usable rewrite is proposed, it may be deleted by any administrator or reduced to a non-infringing stub. Addressing contributors .
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