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The main justification is to prevent software piracy, I suspect. I first became aware of region locking as a kid, when I wanted a video game that wasn’t released in the US. I found an imported copy, was excited to try it, put it in, turned on the system, and......it wouldn’t work. Software piracy is a legitimate concern, but with more robust keys to unlock software, I don’t see region locking as central to piracy mitigation any longer. However, there are other justifications. Many countries apply software rating systems, and they differ significantly. By region locking, publishers can help make sure that they comply with the applicable rating standards.