Which music product packaging innovation was introduced in 2001 as a response to declining CD sales and rising digital piracy concerns?

The music industry has seen dramatic shifts in product packaging over the decades. From vinyl records in cardboard sleeves to digital streaming without physical products at all, packaging has played a crucial role in marketing, brand identity, and consumer experience. This trivia question focuses on an innovative packaging strategy that changed how consumers interacted with music products in the early 2000s.

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The DualDisc format (CD on one side, DVD on the other)
The digipak (eco-friendly paperboard packaging replacing plastic jewel cases)
The Copy Control technology (discs with digital rights management that limited copying)
The MusicDNA format (interactive album packaging with embedded digital content)