The core goal of Commons is maximal reuse. Commercial logos are
frequently under _both_ trademark _and_ copyright.
Felipe Micaroni Lalli wrote:
Short version: Trademarks are very different from
copyright. They are
more like "other laws which restrict the free use" of (any) content and
Commons does already allow seals, flags, coats of arms, Olympic symbols,
the Red Cross and Crescent (all of which are protected quite like
"commercial" trademarks) as well as Nazi symbols (the use of which is
extremly restricted in some legislations such as DE, AT, HU).
I would recommend removing all of those.