Source : Free On-Line Dictionary of Computing

software patent
     
         A patent intended to prevent others from using some
        programming technique.
     
        There have been several infamous patents for software
        techniques which most experienced programmers would consider
        fundamental or trivial, such as the idea of using
        {exclusive-or} to plot a cursor on a {bitmap display}.  The
        spread of software patents could stifle innovation and make
        programming much harder because programmers would have to
        worry about patents when designing or choosing {algorithm}s.
     
        There are over ten thousand software patents in the US, and
        several thousand more are issued each year.  Each one may be
        owned by, or could be bought by, a grasping company whose
        lawyers carefully plan to attack people at their most
        vulnerable moments.  Of course, they couch the threat as a
        "reasonable offer" to save you miserable years in court.
        "Divide and conquer" is the watchword: pursue one group at a
        time, while advising the rest of us to relax because we are in
        no danger today.
     
        Compuserve developed the {GIF} format for graphical images
        many years ago, not knowing about {Unisys}'s 1985 patent
        covering the {LZW} data compression {algorithm} used in GIF.
        GIF was subsequently adopted widely on the {Internet}.  In
        1994 Unisys threatened to sue Compuserve, forcing them to
        impose a sublicensing agreement for GIF on their users.
        Compuserve users can accept this agreement now, or face Unisys
        later on their own.  The rest of us don't have a choice -- we
        get to face Unisys when they decide it's our turn.  So much
        trouble from just one software patent.
     
        Patents in the UK can't describe {algorithm}s or mathematical
        methods.
     
        See also {LPF}, {software law}.
     
        {patent search
        (http://sunsite.unc.edu/patents/intropat.html)}.
     
        (1995-01-06)