Re:Making available... (Score 1)

A paper listing wouldn't qualify for GPL compliance because that isn't the "prefered form of the work for making modifications to it".

Anyway, if the source code isn't shipped with the binaries the license requires that the binaries are accompanied with a written offer to give a machine-readable copy of the source code "on a medium customarily used for software interchange" (paper is disqualified again...) to any third party. The last part really means "anyone that asks" according to the GPL FAQ, even people who haven't received binaries from those who offer the source code.