I've been learning web designing for a while now, and I hope to achieve an internship in this field sometime soon. I've noticed that most prospective employers ask for samples of work while looking at resumes. Since I don't have any real world experience in web design, it's important for me to show some relevant skills at least upfront. While a portfolio is always a given, I have been redesigning some random websites from time to time. Is it legal for me to put up the source code for these websites that I've redesigned on Github? The idea is that since Github repositories are publicly visible, I would be able to show my work through Github to prospective employers. This, I feel, is always better than just claiming - "I have skills in XYZ area".
I'm a graduate student in the US. Will I face legal issues according to US laws if I do this? Should I include some copyright notice in all my Github source folders, something like - "The content designed in the websites is not mine, and I'm just recreating them"? Some of the websites I have re-designed include company logo pictures, which I had to just save (to my computer) and re-use.