In a WebmasterWorld thread Cline posted in message #15 that the hundreds of trademark terms that are automatically disallowed to be used in your ad copy, are also disallowed in the Google AdWords Keyword Tool. Cline explains that "no-researchability does not directly correspond with the no-trademark-in-copy rule, as most trademarks that are prohibited in copy can be found in the keyword tool."
So why do I think Google may change their policy on this tool and trademark tools? Because following that post AdWordsAdvisor responded directly to Cline saying;
I'll include your feedback in this week's Advertiser Feedback Report, cline. I've just pasted it in, as a matter of fact. AWA
Forum discussion at WebmasterWorld.