It appears that Rosen's "reciprocity" is simply another term for the "infectious", or "copyleft" nature of GPL. In that case I fail to see the significance. The

It appears that Rosen's "reciprocity" is simply another term for the "infectious", or "copyleft" nature of GPL. In that case I fail to see the significance. There isn't really any remaining doubt about the enforceability of GPL, which may actually be the reason for the relative dearth of case law.