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A standard DVD case is a single-piece plastic case with two creases, which folds around and snaps closed. It measures 135 mm × 190 mm × 14 mm (5.31 in × 7.48 in × 0.55 in). It is wrapped on the outside by a thin piece of transparent plastic that can hold a paper label.
It was patented in 1992 by Ivy Hill Packaging, a Time Warner subsidiary that made cardboard LP sleeves and CD longboxes. It allowed them to have an eco-friendly case option which used little plastic and allowed the printing of graphics on the inside cover. It also made good financial sense as it repurposed cardboard-manufacturing machinery ...
Standard black keep case. A keep case or poly-box is a type of packaging, most commonly used with DVDs and Blu-ray videos (and sometimes CDs).. Besides DVD-Video films, keep cases are very common with most disc-based video games since the PlayStation 2, and they are also found on many PC titles and MP3-CD audiobooks (all use discs that are the same basic dimensions as a DVD).
Others came with elaborate copy-protection systems such as Zool's circular code wheel, or even a hardware dongle (although these were generally more common on expensive non-game software). Variations on the "big box" format include a box within a sleeve, such as Unreal, and a box with a fold-out front cover, such as Black & White.
The preservation of optical media is essential because it is a resource in libraries, and stores audio, video, and computer data. While optical discs are generally more reliable and durable than older media types, (magnetic tape, LPs and other records) environmental conditions and/or poor handling can result in lost information.
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