I have to wonder whether the combinatorial plethora of creative commons licenses is a problem of some kind.
Believe it or not, I didn't figure out until yesterday that the license names are strings of two-letter tokens identifying modular characteristics of the license. All this time, I had been reading "by," not as an indicator, but as a preposition... I kept thinking it was something like "by" as in "when the wind is north-by-northwest, I can tell a hawk from a handsaw," or "passed by reference," or "two-by- four."
The general public doesn't understand the concept of a free license to begin with, how are they ever going to understand the zoo of possible licenses and what can and can't be done with them?