Implications for practice

To prevent putting your school at risk it is best to assume copyright applies to all material that can be copied. The absence of the © symbol or a copyright statement does not mean the work is not protected by copyright. (Neither does the fact that the material was found on the Internet.)
http://www.tki.org.nz/r/governance/copyright/principals-trustees/managing-copyright_e.php

Legal ramifications:

http://www.nzfact.co.nz/faqs.html

http://www.legislation.govt.nz/act/public/2011/0011/latest/DLM2764327.html