How do I include modified BSD-licensed sources in my application?

Question

Law in IT

This is one of the ANTLR grammars on github , based on which I am going to make a parser and compiler.
The grammar is distributed under the BSD license.
I need to modify it, rename it and use it in my application with an Apache 2 license.
How to do it correctly so as not to violate the developer's copyrights?

Answer 1

Just leave the names of the authors in the modified files and add your own name. In the license of the entire project, indicate that some parts are licensed under BSD, and the rest are Apache. Attach the text of each license to the project. In the head of each file, indicate briefly under which license it is distributed.
Well, in general, this is not the GPL, these litukhus are very liberal. The main thing is not to erase copyrights.