Here are some examples of Reasonable Use Agreements that parents/whanau may be asked to agree to.
http://www.delicious.com/allanahk/AUP
https://docs.google.com/document/d/11FQt3pJbv8lkvzykBXhPUdanDCRccoR7OBj2k6zQdJU/edit
http://www.vln.school.nz/mod/file/download.php?file_guid=423955