On 17/10/06, Roger Luethi collector@hellgate.ch wrote:
In a nutshell, dual-licensing is about offering products gratis to those agreeing to share alike and having those in the proprietary business pay for their use.
The only area with fairly solid evidence on this form of dual-licensing is software, and that's a different industry with a distinct set of attributes. The key for us would be a good idea of derivative works and copyleft licenses as they apply to text, images, or any other content we might own.
There's anecdotal evidence for this happening for images. The Wikimedia enquiry address gets a lot of requests to discuss licensing for an image, generally assuming we're the copyright holder (but sometimes asking directly for the author); money is certainly in the air on some occasions, though I suspect most end up as "Sure, use it, can you put my name on the flyleaf?"