I want content checker

Is there any software that checks any given content, whether if its already used or not.

I have over 5000 PLR articles, which I plan to submit to ezines to get traffic.
So i want to see if the content is already somehere else, So that ezines doesn't refuse to publish my article.
So please help me out.

 

can you not use copyscape?

 

it does seem illogic todo it this way

 

Here is the link to your solution: http://blogoscoped.com/quotefinder/

You can check any number of articles for free without any limitation. Hope it will be helpful....