"Due to trademark reasons, we do not allow advertisers to use 'drive' in their Google AdWords ads. This term may be trademarked either for a certain product or service category and may apply only in certain countries."
Really now Google, that seems like a bit much. I've never had any big problems getting certain "trademark" flagged words by editorial after a reasonable explanation. It just get frustrating after a while when you have to explain yourself every time you want to use a common word like "drive".
I don't think it's Google's fault
Netmeg, I have to disagree - I believe it is Google's heavy handed implementation. This quote from Wikipedia explains trademark law better than I:
It is important to note that trademark rights generally arise out of the use and/or registration of a mark in connection only with a specific type or range of products or services.
Put simply, those trademarks are only applicable in certain industries. So why put that hurdle in place for anybody wanting to use the word 'points' or 'free' in an ad? Ridiculous, IMHO.
why should Google want to get in the middle of a legal spat
Of course, that's not in their interests.
But I'm not aware of other self-serve ad vendors - from newspaper classifieds up - who apply the same logic and disallow common words which happen to be trademarked.
Take two random examples of self-serve ads without similar blocks:
Craigslist search for 'Apple' [newyork.craigslist.org]
Village Voice classifieds search for 'Apple' [newyork.backpage.com]