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For example, the GPLv2 in no way limits your use of the software. If you're a mad scientist, you can use GPLv2'd software for your evil plans to take over the world ('Sharks with lasers on their heads!!'), and the GPLv2 just says that you have to give source code back. And that's OK by me. I like sharks with lasers. I just want the mad scientists of the world to pay me back in kind. I made source code available to them, they have to make their changes to it available to me. After that, they can fry me with their shark-mounted lasers all they want.

Linus Torvalds#45

SoftwareOpen sourceLicensingEthicsLicensePhilosophy

About this quote

What does it mean?
GPLv2 allows unrestricted use of software, even for malicious purposes, as long as modified source code is shared back.
In plain terms
You can use free software for any purpose if you share your changes.
What can you take from it?
Free software licenses prioritize sharing modifications over restricting intent.

Where it applies

  • evaluating licenses
  • explaining GPL
  • debating misuse

Putting it to work

  • choose licenses
  • explain copyleft
  • audit compliance

Questions to consider

  • Does intent matter in open source?

Another view

It does not prevent bad actors from harming others with shared code.

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