If this was a legit request (and not a phishing scam), and if it was true that they wouldn't allow you to blur any details (may not be the case; see other replies to your post), I agree with PryvacyFreak's comment -- that would just make the policy silly:
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These kinds of requests are a total joke.
Anyone can photoshop up a fake id and email them the jpg. None of the anti-counterfeiting features of physical ids apply to scanned copies. And what are they going to compare it to? No way do they have access to the federal government's passport database, and many states won't sell access to their driver's license databases either - and without an id number or address they couldn't reliably look people up in such a database anyway.
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