Winrar's strategy to make people buy

Why can we use WINRAR for free even though it constantly requests us to purchase a license?
It's called "nagware" and this particular approach is used by someone that doesn't want to force users to pay for the software, but they really hope that they will.
So they make the program "nag" the user over and over and over in the hopes that they will get so annoyed with the nagging that they'll fork over the cash, even if they'd originally planned not to.

it also gives them a leg to stand on when it comes to suing businesses (or at least issuing demand letters) who use their software without a license. They don't especially care about personal use, it's businesses where they get their money.

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