First, a word of caution: You probably don’t need this plugin, and shouldn’t install it. Before you install it, make sure that you really need to, and that you’re aware of the security implications. Are you hosting streaming DASH or HLS videos? Do you really need to support outdated browsers? The safest thing to do is avoid installing it. If you do, make sure you always install any updates that become available, to decrease the security risks to your site.
This plugin restores those files, for the tiny minority of sites that are hosting streaming DASH/HLS videos, and still need to support outdated browsers. It also optionally validates the unsafe input that’s passed to the SWF file in some situations, to decrease the risk associated with it. That validation is off by default, though, and only works in some circumstances.
You should only install this if you’re sure that you really need it. See the warning above for details.
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