Japanese copyright law article 30-4 states[1]: > It is permissible to exploit a work, in ... cases ... it is not a person's purpose to personally enjoy or caus

Japanese copyright law article 30-4 states[1]: > It is permissible to exploit a work, in ... cases ... it is not a person's purpose to personally enjoy or cause another person to enjoy ... provided, however, that this does not apply if the action would unreasonably prejudice the interests of the copyright owner ... > i)if it is done for use in testing to develop or put into practical use technology ... > (ii)if it is done for use in data analysis (meaning the extraction, comparison, classification, or other statistical analysis of the constituent ... > (iii)if it is exploited in the course of computer data processing or otherwise exploited in a way that does not involve what is expressed in the work being perceived by the human senses (for works of computer programming, such exploitation excludes the execution of the work on a computer), beyond as set forth in the preceding two items. Japanese legalese is a rather inefficient pseudo-european built on Japanese language, so I wouldn't recommend making decisions based on a blog article like this; there hasn't been too much news stories regarding this too as additional anecdotal datapoint. 1: https://www.japaneselawtranslation.go.jp/ja/laws/view/4207#je_ch2sc3sb5at4 https://www.japaneselawtranslation.go.jp/ja/laws/view/4207#j...