Which innovative marketing campaign in 1455 is credited with making sacred texts widely accessible to the general population for the first time?

Throughout history, religious texts have been subject to various marketing and distribution strategies that have significantly impacted their reach and influence. From ancient scroll reproduction to modern digital platforms, the methods of disseminating spiritual wisdom have evolved dramatically. This trivia question explores a notable marketing campaign that revolutionized how a sacred text reached its audience.

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Gutenberg's mass printing of the Bible, which reduced production costs by over 90%
The Council of Nicaea's standardization campaign for Christian texts
The Medici family's illuminated manuscript patronage program
The Buddhist Tripitaka subscription model for temple distribution