here (1), here (2) and here (3) at LenzBlog, (G z.Zt. im deutschen LenzBlog).

Karl Friedrich Lenz and others won't be "Sugar Daddy" any more and left Creative Commons License.

The juridical background is pointed out in detail here by Dan Bricklin ( (on the other hand CC (+ comments)) and concludes with this simple but accurate advice:

"The bottom line for people: Read legal material you use and ask questions if you don't understand something."

link me