Free Knowledge Culture Calendar/February 14
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![The specification is freely available.](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/ZIP%27s_APPNOTE.TXT%2C_DOS_style.png/220px-ZIP%27s_APPNOTE.TXT%2C_DOS_style.png)
Today in 1989 the .ZIP file format was released into the public domain. After a lawsuit against Phil Katz as a third party developer of an (improved) implementation of the then predominant ARC format, his better and free ZIP format supplanted ARC and sealed the end of the plaintiff company SEA.