I’ve stumbled upon a function in the Stan math library that I’d like to modify for my own personal use. I see that this library is open-source licensed under the BSD 3-Clause license. However, at the top of the file, it mentions copyrights that I’ve seen in the Boost code that it’s likely derived from.
So, what are the rules I have to follow? Sorry if this question is off-topic. If it is, let me know where I should ask it.