Backing up files such as these requires some technical understanding of software. This is distinct from cookies which have directory isolated storage paths for saved cookies while LSOs use a common directory path for all browsers on a single machine.įlash games may use LSO files to store the user's personal game data, such as user preferences and actual game progress. If that same visitor, using the same machine now opens an Internet Explorer browser and visits any page from the site viewed in Firefox, the site can read the LSO value(s) in the Internet Explorer browser, and display dynamic content or otherwise target the visitor.A visitor accesses a site using their Firefox browser, then views a page displaying a specific product, then closes the Firefox browser, the information about that product can be stored in the LSO.By default, LSO data is shared across browsers on the same machine. Also, third-party LSOs are allowed to store data by default. For example, a local shared object from "cannot be read by the domain " However, the first-party website can always pass data to a third-party via some settings found in the dedicated XML file and passing the data in the request to the third party. Īdobe Flash Player does not allow third-party local shared objects to be shared across domains. If the application attempts to store more, a dialog asks the user whether to allow or deny the request. By default, an SWF application running in Flash Player from version 9 to 11 (as of Sept 1, 2011) may store up to 100 kB of data to the user's hard drive. With the default settings, the Flash Player does not seek the user's permission to store local shared objects on the hard disk. Data is stored in the Action Message Format. Local shared objects contain data stored by individual websites. 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. Similar to cookies, they can be used to store user preferences, save data from Flash games, or track users' Internet activity. įlash cookies, which can be stored or retrieved whenever a user accesses a page containing a Flash application, are a form of local storage. 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. ( August 2022) ( Learn how and when to remove this template message)Ī 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. Several templates and tools are available to assist in formatting, such as Reflinks ( documentation), reFill ( documentation) and Citation bot ( documentation).
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