I was going through this website copyscape, which shows the duplicate contents of a website. When I searched for my blog http://nepalsites.blogspot.com I was surprised to see results from other websites with duplicate contents.
It may be alright if you use someone else's content and credit the original author for it, or express your views on that content, but to use someone else's content and take credits for it yourself - is just web plagiarism or cheating. I don't see how duplicating someone else's work can be acceptable in any part of the world. You don't need laws to tell you that piracy is illegal. Web piracy is unacceptable. Simple as that.
No web plagiarism please!