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Round shiny things made of aluminium and plastic. Commonly sold with music pre-recorded on at music stores. The recordable variety is also commonly sold in packs of 10, 25, 50 and 100

Often used for copying Linux distributions onto and distributing at InstallFests.

For audio, the logo "Compact Disc Digital Audio" is actually owned by Philips and licensed for use by manufacturers who meet the RedBook? standard for digital audio. Many forms of CopyControl degrade the audio quality or alter the data structures on the plastic wafer in an attempt to prevent customers using the data. By thus degrading their product, the manufacturers may no longer meet the RedBook? standard, meaning they cannot legally be called CompactDiscs. Since consumers might notice that plastic wafers which do not work in their equipment are missing the "CD" logo and so stop bying such CopyControlled wafers, there is an incentive for manufacturers to mislabel their discs.

So be on the lookout for things that are not CompactDiscs which are labelled illegally while shopping.