Copyright and Copyleft on Open Source Licence

Copyright

Copyright is a legal framework that grants exclusive rights to authors and creators of original works, including software. It gives the author the right to control how their work is used, copied, distributed, and modified. When software is copyrighted, others cannot legally reproduce, distribute, or modify it without the author’s permission.

This is easy to understand as it says “They allow you to use the software only under the conditions they permit”

.Licenses:

• MIT License: This is a permissive license that allows users to use, copy, modify, merge, publish, distribute, sublicense, and sell copies of the software. It requires including the original copyright notice and disclaimers in all copies.
  Examples: Node.js, Ruby on Rails, jQuery, AngularJS, React Native, Homebrew
• Apache License 2.0: This license permits users to use, modify, distribute, and sell the software under certain conditions. It requires including the original copyright notice, a copy of the license, and any disclaimers.
  Examples: Apache HTTP Server, Apache Kafka, Hadoop, Spark, Cassandra, Tomcat, ZooKeeper

What to caution?

You can assume only the difference between open-source and commercial products is that open-source is free. For instance, if you buy a Nike product for free, it doesn’t mean you can change the logo and re-sell it as your product.