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To quote the license itself:

Copyright (C) [year] [copyright holders]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

I am not exactly sure what the bold part implies.

Lets say that I'm creating some library, and I license it under the MIT license. Someone decides to fork that library and to create a closed-source, commercial version. According to the license, he should be free to do that.

However, what does he additionally need to do under those terms? Credit me as the creator? I guess the "above copyright notice" refers to the "Copyright (C) [..." part, but, wouldn't that list me as the author of his code (although I technically typed out the code)?

And wouldn't including the "permission notice" in what is now his library practically license it under the same conditions that I licensed my own library in?

Or, am I interpreting this incorrectly? Does that refer to my obligations to include the copyright and the permission notice?

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The commercial software would need to include the copyright notice for the work it has used. It doesn't mean the entire commercial work is then licensed under the MIT license.

For example, I would expect to see the copyright notice for the commercial software, with the following wording added:

This software includes the Yannbane Awesome Library: Copyright (C) 2012 Yannbane

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

So by including the license, they are letting people know what terms the "Yannbane Awesome Library" is licensed under - as it is different to the terms of the wider commercial application.

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  • 17
    Exactly. It's not unusual for a large product to include several such copyright notices. For example, check out about:license in Firefox.
    – user281377
    Commented Dec 6, 2012 at 10:21
  • 2
    Do these notices have to be included when distributing binaries or just source?
    – André Fratelli
    Commented Sep 28, 2015 at 5:01
  • 6
    With the final clause, the copyright notice must be shipped with the software, so it makes no difference that it is just binaries, you still need to include it.
    – Fenton
    Commented Sep 28, 2015 at 10:07
  • 11
    This is the first answer I've found that addresses my circumstances as a freelance dev using third party components.. tx for the link to the Firefox license!
    – ptim
    Commented Jan 31, 2016 at 10:34
  • 1
    @HBhatia No, it does not make any difference. Just include the MIT license when you distribute your SAAS product.
    – Prakash P
    Commented Jan 22, 2019 at 14:43

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