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If you look at content as a product that needs to be sold (ie, as a fixed entity, like a textbook) then your sales channels, your product marketing team, and the skills needed for marketing become necessary for your business. But, this perspective takes a narrow approach on what open content can be, and reduces it to just a replacement for a textbook. This perspective misses how the value of open content accrues over time. Or, in other words, open content should not be blamed for the failure or success of business models that need to sell content.

Via Andreas Link