(See also this article at PBS MediaShift about the Creator Endorsed Mark, and this example of the mark being used in commerce.)
The Creator-Endorsed Mark is a logo developed by Questioncopyright.org and first used in June 2009 that a distributor can use to indicate that a work is distributed in a way that its creator endorses — typically, by the distributor sharing some of the profits with the creator. The mark is not an alternative to a free license; rather, it's meant to be used in conjunction with free licensing. You release your work under a free license, and then grant or withhold permission to use the CE Mark based on how distributors behave.
As more and more creators freely circulate their works on the Internet, the mark provides a reliable way for non-exclusive publishers to signal to their customers that they are supporting the artist. The mark enables consumers to distinguish distributors based on how supportive of the artist they are, and to allow creators to encourage — not necessarily require, but encourage — particular methods of distribution for their freely-licensed work. Our experience is that given a choice, audiences will often prefer sources that support the artist, when they have a reliable way of recognizing such sources.