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Your contributions are published under free licenses

Per Wikipedia's terms: "To grow the commons of free knowledge and free culture, all users contributing to the Projects are required to grant broad permissions to the general public to re-distribute and re-use their contributions freely, so long as that use is properly attributed and the same freedom to re-use and re-distribute is granted to any derivative works. In keeping with our goal of providing free information to the widest possible audience, we require that when necessary all submitted content be licensed so that it is freely reusable by anyone who cares to access it." When you publish text to which you hold the copyright, you agree to license it under the "Creative Commons Attribution-ShareAlike 3.0 Unported License" and the "GNU Free Documentation License."

Topic: Scope of the copyright license

Wikipedia does not use third-party cookies without your permission

Per Wikipedia's statement on cookies: "Third-party cookies allow us to render services provided by third parties, such as “like” and “share” buttons. When a third party provides these kinds of services, they may require the use of a cookie in order to provide their services. We will never use third-party cookies, unless we get your permission to do so. If you ever come across a third-party data collection tool that has not been authorized by you (such as one that may have been mistakenly placed by another user or administrator), please report it to us at privacy@wikimedia.org."

Topic: Third Parties

Many of Wikipedia's cookies are temporary and deleted at the end of a browsing session or after a specified period of time

Wikipedia gives an in-depth and transparent explanation of the types of cookies it uses on its website. Many of them are temporary for users that are not logged in. The full list, which is written in easily understandable terms, is available here: https://wikimediafoundation.org/wiki/Cookie_statement

Topic: Cookies

Wikipedia does not share your personal information with any third parties for marketing purposes

Per Wikipedia's privacy policy: "We are strongly committed to not sharing nonpublic information with third parties. In particular, we do not allow tracking by third-party websites you have not visited (including analytics services, advertising networks, and social platforms), nor do we share your information with any third parties for marketing purposes."

Topic: Personal Data

Wikipedia provides users with substantial notice of changes to its privacy policy and allows for a comment period

Per Wikipedia's privacy policy: "Because things naturally change over time and we want to ensure our Privacy Policy accurately reflects our practices and the law, it may be necessary to modify this Privacy Policy from time to time. We reserve the right to do so in the following manner: In the event of substantial changes, we will provide the proposed changes to our users in at least three (3) languages (selected at our discretion) for open comment period lasting at least thirty (30) calendar days. Prior to the start of any comment period, we will provide notice of such changes and the opportunity to comment via the Wikimedia Sites, and via a notification on WikimediaAnnounce-L or a similar mailing list. For minor changes, such as grammatical fixes, administrative or legal changes, or corrections of inaccurate statements, we will post the changes and, when possible, provide at least three (3) calendar days' prior notice via WikimediaAnnounce-L or similar mailing list."

Topic: User Involvement in Changing Terms

Wikipedia keeps only certain types of non-personal data indefinitely, while other personal is kept at most for 90 days

Wikimedia provides guidelines for how it retains your data here: https://meta.wikimedia.org/wiki/Data_retention_guidelines This document is easy to read and clear, though community consultation for it appears to have closed in 2014.

Topic: Personal Data

Wikipedia does not assume liability, and in cases where it is applicable, Wikipedia caps its liability at $1,000

Per Wikipedia's terms of use: "The Wikimedia Foundation will not be liable to you or to any other party for any direct, indirect, incidental, special, consequential or exemplary damages, including but not limited to, damages for loss of profits, goodwill, use, data, or other intangible losses, regardless of whether we were advised of the possibility of such damage. In no event shall our liability exceed one thousand U.S. dollars (USD 1000.00) in aggregate. In the case that applicable law may not allow the limitation or exclusion of liability or incidental or consequential damages, the above limitation or exclusion may not apply to you, although our liability will be limited to the fullest extent permitted by applicable law."

Topic: Law enforcement and due process