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{{Short description|Adobe Flash data stored on a user's computer}}
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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>
== 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/
|archive-date=
|title=Study: Adobe Flash cookies pose vexing privacy questions
|work=[[Network World]]
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}}</ref>
On 10 August 2009, [[Wired (magazine)|''Wired'' magazine]] reported that more than half of the top websites used local shared objects to track users and store information about them, but only four of them mentioned it in their privacy policy. "Flash cookies are relatively unknown to web users," the article said, "even if a user thinks they have cleared their computer of tracking objects, they most likely have not." The article further says that some websites use Flash cookies as hidden backups so that they can restore HTTP cookies deleted by users.<ref name="wired-you-deleted-your-cookies-think-again">{{cite
|url=https://www.wired.com/epicenter/2009/08/you-deleted-your-cookies-think-again/
|title=You Deleted Your Cookies? Think Again
|
|publisher=Condé Nast Digital
|first = Ryan
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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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|author=Information Commissioner's Office}}
Local shared objects were the first subject to be discussed in the [[Federal Trade Commission]] (FTC) roundtable in January 2010.<ref>{{cite web |url=http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2010/01/29/BUMN1BP4MN.DTL |title=All eyes on online privacy |author=James Temple |date=2010-01-29 |publisher=San Francisco
<ref>{{cite web |url=https://www.engadget.com/2010/12/04/ftc-says-its-talking-to-adobe-about-the-problem-with-flash-cook/ |title=FTC says it's talking to Adobe about the problem with 'Flash cookies' |author=Donald Melanson |date=2010-12-04 |publisher=Engadget |access-date=11 February 2011}}</ref>
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