Back in May, Apple quietly filed a legal petition to try and invalidate a key patent by cinema camera maker RED, and RED is not taking it lying down. The patent in question describes RED’s “REDCODE” codec for visually lossless, compressed 4K video at 23fps and above—one of the patents at the very core of RED’s history as a company and camera maker. The report originally surfaced on EOSHD, where Andrew Reid discusses the technical merits of each side’s argument,…