yes their are many sites those provide free articles if you don't remove mentioned sources . You can use others articles also but don't post them full post 4 to 5 lines than refer them to their original article link to read more .
You need explicit permission to copy the content of other sites onto your own. There are sites that provide content for free such as ezinearticles.com, just follow their terms of service.
He's not referring to contents but contain. Please answer his question. Is it legal to use contain? I gots to know. Where would we be without articles with contain?
Do research in google put something like that related:ezinearticles.com and you will get a bunch of article diretory good luck