>The Transformative Factor: The Purpose and Character of Your Use
>In a 1994 case, the Supreme Court emphasized this first factor as being an important indicator of fair use. At issue is whether the material has been used to help create something new or merely copied verbatim into another work.
IMHO simply re-implementing an API is not creating something new. It's just redoing something that has already been done. A translation layer from one API to another is a new thing separate from the original API.
>The Transformative Factor: The Purpose and Character of Your Use
>In a 1994 case, the Supreme Court emphasized this first factor as being an important indicator of fair use. At issue is whether the material has been used to help create something new or merely copied verbatim into another work.
https://fairuse.stanford.edu/overview/fair-use/four-factors/
IMHO simply re-implementing an API is not creating something new. It's just redoing something that has already been done. A translation layer from one API to another is a new thing separate from the original API.