Learn in the textbookMultimedia Basics, Delivery, and Rights Protection
DefinitionCPRM is a copyright protection technology used on writable recording media that controls how many times content can be copied.
ExplanationSome digital broadcast programs carry copy conditions, such as "may be recorded only once" (copy-once), and CPRM-compatible devices and media honor that condition when recording. The recorded content is encrypted, so devices without CPRM support cannot play it.
AnalogyLike a punch card good for a set number of rides, the uses are fixed in advance, and once they run out the card is done.
Memory hookIt stands for Content Protection for Recordable Media, and the RM at the end shows that its target is recording media.