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software law
Software may, under various circumstances and in various countries, be restricted by patent or copyright or both. Most commercial software is sold under some kind of {software license}.
A patent normally covers the design of something with a function such as a machine or process. Copyright restricts the right to make and distribute copies of something written or recorded, such as a song or a book of recipies. Software has both these aspects - it embodies functional design in the algorithms and data structures it uses and it could also be considered as a recording which can be copied and "performed" (run).
"Look and feel" lawsuits attempt to monopolize well-known command languages; some have succeeded. Copyrights on command languages enforce gratuitous incompatibility, close opportunities for competition, and stifle incremental improvements.
{Software patents} are even more dangerous; they make every design decision in the development of a program carry a risk
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