My brain went to DeCSS, which, weirdly, the DVD licensing company lost because enough people had (illegally?) published it. https://en.wikipedia.org/wiki/DVD_C

My brain went to DeCSS, which, weirdly, the DVD licensing company lost because enough people had (illegally?) published it. https://en.wikipedia.org/wiki/DVD_Copy_Control_Ass%27n,_Inc._v._Bunner https://en.wikipedia.org/wiki/DVD_Copy_Control_Ass%27n,_Inc.... I think there was also the Sony jailbreaking guy who settled with Sony out of court.