by law

根据法律中释

1 These actions are prohibited by law if you do not accept this License..若您不接受本授权，则这些行为在法律上都是被禁止的。

2 Microsoft and the British Library, which by law purchases at least one copy of every book published in the UK, have been scanning the books over the past three years..根据法律要求，微软公司和大英图书馆通过至少购买一本在英国出版的图书方式，把图书扫描成电子版工作已经进行了三年以上。