Copyright doesn't work like that.
In this case, I reckon the Terms strictly don't allow it -- it's an
image provided as API Content and you can't make a derivative work --
but it's unlikely to cause a problem. However, the easy way around it
which I would use in this case is to draw your own version.
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This may help: http://www.google.com/permissions/guidelines.html
Google's "brand features" include "other distinctive features", and
the teardrop marker may well be deemed to fall into that category.
It's almost certainly "imagery associated with Google":
# Don’t incorporate Google Brand Features into your own product name,
service names, trademarks, logos, or company names.
# Don’t copy or imitate Google’s trade dress, including the look and
feel of Google web design properties or Google brand packaging,
distinctive color combinations, typography, graphic designs, product
icons, or imagery associated with Google
More: http://www.google.com/intl/en/permissions/
The only permission form to ask Google's opinion appears to be at
http://www.google.com/support/contact/bin/request.py?contact_type=film_app&&hl=en