3 ms·Newton was public domain by Einstein's time.by thedailymail 2y agoNewton was public domain by Einstein's time.jampekka 2y agoIndeed. Copyright was introduced in 1710, Principia was published in 1687.yieldcrv 2y agoand even with our current copyright laws providing for long dated protection, it would have still been in public domainjampekka 2y agoIt's hard to say what the current laws actually imply. Steamboat Willie was originally meant to be in the public domain in 1955. Got there in 2024.