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From what I have read, so much of the web is duplicate content so it really doesn't matter if the pdf is on other sites; let google figure it out. (example, every car brand dealer has a pdf of the same car model brochure on their dealer site) No big deal. Visitors will be landing on your site from other search relevance - the duplicate pdf doesn't matter. Just my take. Adrian

Great Information It's Working For Me Thankyou.

Thanks Darin

First of all those more detailed URLs should have been handled via canonical tags and not via robots.txt You are probably safe to allow the detailed URLs to rank, try allowing a sample of them to rank whilst keeping others disallowed. First, fix the architecture. Stop using robots.txt and on the detailed URLs, make them canonical to their parents Once that is done, select a volume of the detailed URLs as a test. Remove the canonical tags from those URLs, allowing them to index. Do they start ranking, performing? Do you get duplicate content warnings? Depending on the outcome, you may want to lift the canonical tags from all detailed URLs, or even reverse the canonicals so that the detailed pages have ranking preference