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It is also the name of the popular, now discontinued tool used to edit subtitles. Hardsubbing is irreversible but does not require VSFilter or other special resources for playback. Softsubbing allows the end user to choose whether subtitles will be displayed, and makes it possible to include multiple subtitle streams in the same video file. The current version of SSA is v4.
There are many freeware and open source subtitling applications that support the SSA format. This is a Sub Station Alpha v4 script.