Standing is a legal term for having sufficient basis to make a claim in court. For a silly example, I can't enforce Microsoft's patents in court. I don't own the patents, so I have no ground to stand on to act as the enforcer.
This excerpt from a Patently-o article provides a good example from a real case (not about software):
Mundi Fomukong is a co-inventor of the patents-in-suit. At the time of the invention, Fomukong was married to Fonda Whitfield. Sometime after the first patents issued, Fomukong and Witfield divorced. Later, the second patent issued; Fomukong formed Enovsys; and he (along with his co-inventor) assigned their rights to the new company. Later, when Enovsys sued Sprint-Nextel, the defendant challenged the case on standing. Sprint's argument is based on the rule that any patent infringement actions must be brought jointly by all co-owners of the patent. Specifically, Sprint argued that Ms. Whitfield retained an interest in the patent rights even after the divorce and, without Ms. Whitfield's support, Enovsys lacked standing.
 Related pages on en.swpat.org
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