From The United States Supreme Court:

Some of the amici refer to what Google did as “reimplementation,” defined as the “building of a system . . . that repurposes the same words and syntaxes” of an existing system—in this case so that programmers who had learned an existing system could put their basic skills to use in a new one. Brief for R Street Institute et al. as Amici Curiae 2.

Brief for R Street Institute et al. as Amici Curiae 15–20 (describing Oracle’s reimplementation of other APIs); see also Brief for American Antitrust Institute as Amicus Curiae 7 (“Copyright on largely functional elements of software that [have] become an industry standard gives a copyright holder anti-competitive power”).