Digital Rights Management
When I use software to stop potential pirates and thieves from contravening my simple license mechanism, that protects my lovingly crafted intellectual property: well that's just common sense.
But when someone else uses software to restrict what I can do with the products I've paid good money for, it's The Evils of DRM And I Do Not Approve. See also "If by whiskey."
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It gives you 4 easy steps to find and validate a humble product idea.