You don't. You either buy articles or use the ones listed at article directories but those are not unique.
Fresh unique content never comes for free. Content that adds value to a site or page has inherent value of its own. The only way to get fresh, unique content is to write it yourself or commission it from a trustworthy source.
Somehow I doubt that was what the OP had in mind. I guess kind of gave it away This fella is looking for a free lunch. No more, no less.
Well you don't get anything that works and makes you money for free. Why do you think all of us here are doing, asking for writers for hire, looking for writers etc? Shell out some bucks i am sure you will get what you want.
Oh Lord! Like that illusive man the woman spends her life searching for : "Caring, understanding, smart, well-bred, wealthy, sane and sober". Do you think such a man exists (at least in a woman's world?) ? What was your question, again?
Think about it for a second. Why on earth would a man write an article for you without a fee when there exists a market that would pay him for it?
Go down a back alley in your favorite rough neighborhood, take a pencil and paper and copy off the brick walls. You'll find plenty of original stuff there. Free too! Just don't wear any gang related colors. Before you post your "without copywrited fresh,unique content" online, you might need to run it through a spell checker first. I hear Microsoft has a really dinky little spell check that comes with some word-processing software you can also get for free from Pirate Bay. No, really, you can!...