Keyword rich SEO text

We are looking for a freelancer to write keyword rich content around several different subjects and lists of keywords. We expect each article to be in the region of 500 – 600 words. The topic(s) can be researched and re-written from other sites on the web as long as it is original and not directly copied. We will be using plagiarism software to check for direct copies of other web sites. We require the copyright to be transferred to us for the completed articles. Thanks for reading and good luck!