I don't think it is so easy to draw the line & say all copying is wrong or even copying of copyrighted material. I think a good example would be this series http://www.everythingisaremix.info/watch-the-series/
. The fashion industry is a thriving copy-cat community (fashion is considered to utilitarian to be copyrighted). http://www.ted.com/talks/johanna_bla...e_culture.html
. Whilst strictly copy something thread for thread I'd consider wrong, or maybe even just dumb, getting ideas from someone else and using a small part of someone else work/idea in something of your own that could be considered original
I would not consider unethical. And just for fun a brief history of copyright http://www.youtube.com/watch?v=tk862BbjWx4
. Sure copyright is a good thing but I think it's power is abused.