When you make something original, the law can protect it. When you use someone else’s work, you need to know the rules. This lesson covers copyright, licensing, and the open-source movement.

Intellectual property and copyright

Intellectual property (IP) is creative work that belongs to its creator: writing, music, art, photos, software, and inventions. Copyright automatically gives creators exclusive rights to copy, share, and adapt their original work. You usually need permission to use someone else’s copyrighted work.

Digital technology makes copying effortless, so it is easy to violate copyright by accident, for example by posting a song or photo you do not have rights to. Violations can lead to takedowns, fines, or lawsuits.

Some uses are allowed without permission under fair use (in the United States), such as brief quotation for criticism, news, or education. Whether a use is fair depends on factors like purpose, amount used, and effect on the creator’s income. It is a judgment, not a simple rule.

Licenses and Creative Commons

A license states what others may do with a work. Creative Commons (CC) licenses let creators share work with clear conditions. Common elements:

  • BY (Attribution): you must credit the creator.
  • NC (NonCommercial): you may not use it to make money.
  • ND (NoDerivatives): you may share it but not change it.
  • SA (ShareAlike): adaptations must use the same license.

A work marked CC BY-NC means you can use and adapt it with credit, but not commercially. The public domain includes works with no copyright restrictions, such as very old works or those dedicated to the public.

Always cite your sources and give credit for code, images, and data you reuse.

Open source

Open-source software has its source code publicly available, and licenses let people use, study, modify, and share it. Famous examples include Linux, Firefox, and Python. Benefits:

  • Many people can find and fix bugs.
  • Anyone can learn from the code.
  • Innovation builds on shared foundations.
  • Costs are lower for users.

Open source still has licenses. Some (such as the GPL) require that modified versions also stay open; others (such as MIT) are more permissive. Projects that use open-source code must follow those terms.

Balancing interests

Creators deserve credit and income, while society benefits when knowledge is shared. Different licenses reflect different balances. Whenever you reuse a library, image, or snippet, check its license first.

Check your understanding

1. What does copyright give a creator?

  • Exclusive rights over copying and adapting their original work
  • Ownership of the Internet
  • Permission to use any work
  • No rights

Answer: Exclusive rights over copying and adapting their original work. Others generally need permission.

2. What does a Creative Commons “BY” condition require?

  • Payment
  • Giving credit to the creator
  • Deleting the work
  • Keeping it private

Answer: Giving credit to the creator. Attribution is required.

3. What is open-source software?

  • Software whose source code is publicly available under a license permitting use and modification
  • Software that is always free of bugs
  • Software that cannot be changed
  • Software kept secret

Answer: Software whose source code is publicly available under a license permitting use and modification. Licenses still set conditions.

4. A photo is licensed CC BY-NC. Which use is allowed?

  • Selling it on posters with no credit
  • Using it in a free school poster with credit
  • Claiming you took it
  • Removing the creator’s name

Answer: Using it in a free school poster with credit. It requires attribution and prohibits commercial use.

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