Legal Guide for Bloggers

Before I started setting up my blogs, I was concerned with posting some materials coming from other sources particularly from the internet. It's well and good that we have the freedom to express ourselves thru our blogs but do we have the right to copy materials from others and post it in our blogs? I've found a good link for this and it presents FAQs and other legal stuffs on blogging. http://www.eff.org/bloggers/lg/faq-ip.php