At #teamTAFE you’ll hear this over and over again: copyright matters! There are laws in place [pdf] to ensure we don’t just use whatever content we find online. Admittedly those laws are complex because they can vary from jurisdiction to jurisdiction. Many countries use their own copyright laws to determine whether or not a violation has occurred. You can read more about international copyright law here.
You should just assume you cannot
steal borrow the wonderful stuff you find online.