That looks to me like a "not-written-by-a-lawyer" clause.
For example, if I'm not a "person" or an "organization", I'm not allowed to use it.
Lesson to the rest of us: look at the existing "tried and tested" licences and choose the one that is closest to what you want. Don't write your own.
I'm guessing this code is fairly old, and I suspect that would be less likely to happen today.
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