In reply to Ryan McCue.

Ricahrd, no. This is against the GPL and licenses that require attribution are not compatible with the GPL. Long time ago (yes I am too old) a variation of MIT type licenses required attribution, this obviously caused hell with linux distributions, and RMS/EFF decided to call this kind of licenses non compatible which is why you probably don't see them anymore (OPENSSL had such a license).

Attribution is not related to anything "done properly" with the GPL, it is just politeness which is not forced by the license.