Which music packaging innovation was the first to receive a patent specifically for its unique design that protected discs while allowing easier consumer access than traditional jewel cases?

The music industry has constantly evolved how physical albums are packaged and presented to consumers. From vinyl sleeves to innovative CD cases and limited edition box sets, packaging design has been crucial for artist expression and marketing. This trivia question explores a groundbreaking packaging innovation that changed how consumers interacted with physical music products.

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The Digipak (paperboard folder with plastic tray)
The SlidePak (sliding cardboard sleeve system)
The Discbox Slider (DBS)
The Softpak (flexible plastic sleeve with spine)