* Paul Jakma: > It's less clear to me though whether there is an issue on the copyright > and GPLv2+ licence side. The concern that has been raised with me is > that the Cisco grant is conditional and revocable with potential > royalties applying, while the GPLv2+ seems to require unconditional, > non-revocable patent grant. > > "7. ... For example, if a patent > license would not permit royalty-free redistribution of the Program by > all those who receive copies directly or indirectly through you, then > the only way you could satisfy both it and this License would be to > refrain entirely from distribution of the Program."
But that only applies after a patent dispute, so I don't see how this is relevant to the discussion. The GPL, version 2, does not say anything about the need to obtain patent licenses proactively, which would be a futile effort anyway in most cases.