Whats about those publisher who publish article from free article directory? & my another question is, if A publish from article directory where author is B who post this article that is steal from site C then .......???
article directories are authorized to publish those articles and the person/company that submit an article to the article directory authorize the publication and distribution therefore there is no copywrite issue
Well, if you use an article from an article directory, you are supposed to leave the links to the author's site in the article. That is why they allow you to use their articles. And if you follow that simple rule, nobody will complain about it.