...careful heed to each of the two socially useful, but antithetical, interests mediated by copyright We must take care to guard against two extremes equally...who have employed their time for the service of the community may not be deprived of their just merits and reward for their ingenuity and labor; the other...

...a delicate balance between private and public interests. "We must take care," Lord Mansfield wrote, "to guard against two extremes equally prejudicial;...who have employed their time for the service of the community, may not be deprived of their just merits, and the reward of their ingenuity and labour;...