If someone takes your thoughts and rewords it Copyscape will have a harder time detecting it. It was my understanding they look for patterns of the same words and sentences. Right?
The difference in ezinearticles and PLR is that with ezinearticles you must copy the content "as is" and cite the source. With PLR you have rights to make any changes and not cite the source. You are given the license to do as you wish with the provided articles.
In essence, using PLR is no different than someone taking a random article from someone's site and re-wording. The second method doesn't cost you a dime but it's unethical. At least with PLR you are given the rights to change it as much or as little as you need to.
Also there's a fine line here too. It's one thing to take an article and paraphrase every sentence versus taking an IDEA from an article, expanding it and developing a totally different article from someone's basic ideas. I don't think there's anything wrong with the latter.
Either way I just prefer to right my own stuff. That way I know I'll stay out trouble and it's ethical.
Did I answer the question? I feel like I'm typing a lot but not saying anything. I think I'm sleepy. LOL