Dual and Multiple Licensing
The owner of a copyright can license his or her work any number of times. Distributors of proprietary software do that when they grant discounts to favored customers, issue blanket licenses for unlimited copies to large corporations, and apply shrink-wrap licenses to copies sold in stores.
The MPL license described in Chapter 7 offered one example of dual licensing. Under the MPL, the Initial Developer may designate portions of the Covered Code as Multiple-Licensed. This allows any licensee to choose to accept those portions under the MPL or a second license specified in “Exhibit A.” Where that option is used, Initial Developers often choose the GPL.
More sophisticated examples than this of dual and multiple licensing ...
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