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{{Short description|Adobe Flash data stored on a user’suser's computer}}
{{Redirect2|Sol file|.sol file|mathematical data format|Sol (format)}}
{{Other uses|.sol (disambiguation){{!}}.sol}}
 
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A '''local shared object''' ('''LSO'''), commonly called a '''Flash cookie''' (due to its similarity with an [[HTTP cookie]]), is a piece of data that websites that use [[Adobe Flash]] may store on a user's computer. Local shared objects have been used by all versions of [[Flash Player]] (developed by Macromedia, which was later acquired by [[Adobe Systems]]) since version 6.<ref name="adobe-lso">{{cite web
|url = https://www.adobe.com/products/flashplayer/articles/lso/
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}}</ref>
 
Flash cookies, which can be stored or retrieved whenever a user accesses a page containing a Flash application, are a form of local storage. Similar to cookies, they can be used to store user preferences, save data from [[Flash game]]s, or track users' Internet activity.<ref>[{{cite web|title=When the cookies crumbled, so did your web anonymity|language=en|website=The Guardian|date=2014-10-04|access-date=2023-12-28|url=https://www.theguardian.com/technology/2014/oct/05/cookies-crumbled-internet-anonymity The Guardian newspaper, When the |archive-url=http://web.archive.org/web/20230605133635/https://www.theguardian.com/technology/2014/oct/05/cookies -crumbled, so did your web -internet-anonymity, 5 October 2014]|archive-date=2023-06-05}}</ref> LSOs have been criticised as a breach of [[browser security]], but there are now browser settings and addons to limit the duration of their storage.
 
== Storage ==
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As with HTTP cookies, local shared objects can be used by websites to collect information on how people navigate them, although users have taken steps to restrict data collection.<ref name="networkworld">{{cite news
|url=http://www.networkworld.com/news/2009/081109-study-adobe-flash-cookies-pose.html
|archive-url=https://web.archive.org/web/2015041820472720140404201520/http://www.networkworld.com/articlenews/2246937/applications2009/081109-study--adobe-flash-cookies-pose-vexing-privacy-questions.html
|archive-date=20152014-04-1804
|title=Study: Adobe Flash cookies pose vexing privacy questions
|work=[[Network World]]
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|first = Tanzina
|last = Vega
|author-link = Tanzina Vega
|date = 2010-09-21
|access-date = 2011-05-05
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| {{Free|[[BSD License|BSD]]}}
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|[httphttps://sourceforge.net/projects/soleditor/ .sol Editor]
| Alexis Isaac
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| {{Nonfree|[[Freemium]]}}
| {{Nonfree|premiumware}}<ref>https://ccleaner.com/docs/ccleaner/ccleaner-settings/cleaning-flash-cookies</ref>
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