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1. The purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes (使用的目的和性质,包括此种使用是商业目的还是非盈利的教育目的); -
2. The nature of the copyrighted work (版权作品的本质); -
3. The amount and substantiality of the portion used in relation to the copyrighted work as a whole (如果将版权作品作为整体来看,那么使用的部分的数量); -
4. The effect of the use upon the potential market for or value of the copyrighted work (使用对作品的潜在市场或价值的影响)。 -



