Thanks Zeus. It is good to know that this duplication wouldn't affect my site :)
FYI, my site was on page 1 in Yahoo for a very competitive term but with this recent update it went to page 2. When I saw this change in ranking I thought it was due to my site title and meta being duplicated by others.
Thanks Pathak. I really appreciate the feedback I am getting 
Anyways, I will not do any changes as I have also thought o idea of having a negative effect. If I change it, my site will be on the scarper sites again and again... I will wait for the update to cool down and give it another round. Page 2 on yahoo = zero traffic.
The scraping happened to me too. The way I reported it to Yahoo! was to look up my site by way of the keyword in the search engine. Then at the top to the right there is a small "Help" button. Click on that and you will see a link for Spam and Deletions that you can use to report it. They take a long time to respond so do it ASAP.
Same thing happened to me. Scrapers after this update have gotten the upperhand. I got into an arguement with another SEO about it and then I proved some very valid points to him about how Yahoo hides all it's clickable links with 302's and the green link Yahoo reports does not always represent what I found to be the site URL that actually linked to me. Wish I could provide you link examples. I found redirected sites, cloaked sites, scraper directories stealing titles and descriptions ...Can you say dupe content filter? Can you say bad update very bad update?