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ITC revolutionized the type business by ushering in the era of licensing. ITC licensed typefaces from designers, and then licensed those designs to typesetting device manufacturers (like Linotype, Monotype, Berthold, etc.). These licensees were free to "adapt" the design to fit their machines. In the case of Berthold, this was done quite a lot, as Günter Gerhard Lange, their type director, had very high standards. The original type designers where paid royalties—about ten percent—on these sales.
Typesetters and graphic designers did not license fonts directly from ITC until the digital-era ended the reign of proprietary typesetting equipment. But today, anyone can license the typefaces through a simple download process. Visit http://www.itcfonts.com to see the collection.