s 191 Relevant matters in deciding whether use is fair
191. Subject to sections 192, 193 and 194, all relevant matters must be considered in deciding whether a work or a protected performance (including a recording of the performance) is fairly used, including —(a) the purpose and character of the use, including whether the use is of a commercial nature or is for non‑profit educational purposes; (b) the nature of the work or performance; (c) the amount and substantiality of the portion used in relation to the whole work or performance; and (d) the effect of the use upon the potential market for, or value of, the work or performance.