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Sometimes, perhaps due to code's history, a project is released under several different licenses at the same time. An example of this is ranges-v3. What is the name for this practise?

To be clear I'm not asking about dual-licensing / multi-licensing, which is when the recipient can choose which of several licenses to follow. My question is about when the terms of several different licenses must all be followed.

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    The license you link to isn't saying one thing is released under multiple licenses, it's saying several things are distributed under their respective licenses.
    – curiousdannii
    Commented Dec 3, 2018 at 14:27
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    @curiousdanii That is certainly one way to look at it, but all the constituent parts are released together as a single unit.
    – Stewart Becker
    Commented Dec 4, 2018 at 9:27

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The practice you are referring to is "using code written by others that is under a different license". This happens most frequently when you take code from other projects and incorporate that in your codebase.

As mentioned in the readme file of the project:

Most of the source code in this project are mine, and those are under the Boost Software License. Parts are taken from Alex Stepanov's Elements of Programming, Howard Hinnant's libc++, and from the SGI STL. Please see the attached LICENSE file and the CREDITS file for the licensing and acknowledgments.

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  • That is a good description of what has happened in this case. Does it have a (shorter) name?
    – Stewart Becker
    Commented Dec 5, 2018 at 13:09

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