Talking with grandkids after church, I made made a cultural reference to the hippy-dippy days of the late '60s when I mentioned Keep on Trucking, the iconic image by Robert Crumb. The grandkids, of course, had no idea what I was talking about. Originally appearing in Zap! comics, the image resonated with the culture of the day and was immediately pirated. Crumb moved to protect the copyright on his work and the case eventually made its way to the Ninth US Circuit, where Crumb was able to repair his rights to the image. Crumb never really wanted to become the iconic image of the hippys, but the damage was done.
still printed on T-shirts today.