I agree with you that the use of materials brings another task to us and it is to read the licences before incorporating into our own creation. Sometimes, the licence is not easy to find in the website, the wording is not so easy to understand and if it is too complex, I tend to drop it and look for another similar resource. I also agree that we need to educate children about it. My workmate just told me last week that she received a call from the company that provided her with internet access that somebody downloaded a copyrighted film from her IP address. She didn't know but her teenage boy downloaded a film a couple of days before by "accident". Then she received an email from the Warner Bros Entertainment Co that she needed to pay the copyright fees. The copyright issue is not so simple it is serious!