These are not a problem if you configure the
Flash Player Settings Manager correctly. In addition, CCleaner (Windows) can be set to remove these items.
My Linux distro is configured to send this garbage to /dev/null so it is impossible for that data to be stored on my system.
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http://www.mistered.us/tips/flash/settings.shtml
You can disable Local Shared Objects on a per-site basis or for all sites using the Macromedia Flash Player Settings Manager. You can also delete data that may currently be stored locally.
The Global Storage Settings Panel allows you to allow or deny Flash content you visit in the future from storing information in local shared objects.
The Website Storage Settings Panel lets you customize this decision per website. You can use this panel to create a "block list" for specific websites. You can also use this panel to delete all existing data, without affecting the performance of Flash content in your browser.
...changing your Global Flash Settings to NOT store Local Shared Objects (which will also in effect disable PIE)...
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http://vlaurie.com/computers2/Articles/pie.htm
Tracking files (PIE) already downloaded to your computer via ads in Flash format can be removed with the settings manager at the Macromedia site. Repeat downloads from sites already visited can also be blocked. However, future downloads of tracking files from sites not previously visited can only be blocked in a global sense.
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http://epic.org/privacy/cookies/flash.html
Flash cookies are stored in a special directory depending on the operating system on the client machine. They are arranged in directories according to the site that placed them on the computer (look for a file with a .SOL extension):
<b>·</b> Windows C:\Documents and Settings\[username]\Application Data\Macromedia\Flash Player
<b>·</b> Macintosh OSX /Users/[username]/Library/Preferences/Macromedia/Flash Player
<b>·</b> GNU-Linux ~/.macromedia
Like normal cookies, Flash cookies are represented as small files on users' computers. To prevent Flash cookies from being placed, users can adjust preferences on a per site basis in the Macromedia Website Privacy Settings Panel. Using this tool, Flash cookies can be completely disabled or allowed on a per domain basis.
To get to the settings panel, right click on any Flash movie, click settings and then advanced. Macromedia has published a walk through guide to help users disable Flash cookies.
Users can get rid of the current Flash cookies and their tracking information simply going to the correct folder and deleting them. The Flash cookies are organized in folders according to the site that placed them, so users can choose which objects to keep.