Thanks for the quick reply Tedster. I found an older forum post [webmasterworld.com...] that discussed different doctypes with the canonical URL and wasn't sure if it was outdated.
I also optimize pdfs with title, meta data, copyright info and embedded link.
I've read through the "canonical support in the http header" thread several times. I understand that there's no way to place a canonical link IN the pdf. Without giving you a major headache, how do you "send" the canonical URL in the http header? I thought I finally had it figured out by placing the canonical link element TO the PDF document IN the html document (sample given above).
p.s. Not related - but amazing...while trying to find the thread reference using Google site search on Webmasterworld, this thread is already indexed in Google! Less than 20 minutes...amazing...