Freelance rewriters problem???

Does rewriting PLR articles has any legal (copyright) issues?
I want to know because I want to rewrite PLR and make it unique (passes several tests like copyscape and dupefree and then sell them).
I don`t think that passing these tests will make the whole thing ok.
I want your opinion on these please.Take care

the PLR should still be rewritin, right?
So your site dosn't have duplicated content.

I understand that but if output article has similar ideas or similar context with someone else reputed writer you can get sued or de-indexed. How can you get protection about this kind of stuff. I know that the chances are very little but there is still a chance getting punished.
Thanks for the replies, love to hear someone else opinion about this. Thank you