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What's a DVD?
An invented creation used to segment regions of the Earth in homebrew RPG campaigns :P
An extremely successful physical format for storing data, mostly as video, released in 1996, it is still one of, if not the most popular video format sold globally.
And while they tried to DRM it, the DVD standard still ended up having to maintain compatibility across all readers and discs, but for bluray they regularly deprecate older readers who no longer can play newer movies because new releases use new encryption keys which the old readers don't have access to (and for this reason the PS consoles are the best bluray movie players because Sony keeps them updated)
Never forget, there was only a single key for DVD decryption, once found, DVDs could be copied. There were lawsuits trying to suppress the knowledge, but people started printing the key on tshirts.... It was out there and DVD copy applications became common