Which major dictionary publisher faced significant financial trouble after investing millions in a CD-ROM product that failed because they required customers to mail in physical proof of purchase?

The dictionary market has seen dramatic shifts in how language resources are developed, marketed, and consumed. In the transition from physical to digital formats, some companies innovated brilliantly while others faltered. This trivia question explores a fascinating product innovation failure in the linguistics industry that teaches valuable lessons about understanding your audience's evolving needs and technological shifts.

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Oxford University Press with the Oxford English Dictionary CD-ROM (1992)
Merriam-Webster with the Webster's Third New International Dictionary CD-ROM (1997)
Encyclopædia Britannica with Britannica Language Dictionary Suite (1995)
Random House with the Random House Unabridged Dictionary Digital Edition (1993)