I bought this book (http://www.amazon.com/exec/obidos/tg/detail/-/0893815233/qid=1121949643/sr=8-1/ref=sr_8_xs_ap_i1_xgl14/104-0280802-1159924?v=glance&s=books&n=507846") after taking an Art Law course last year. It was on U.S. law but they seem similar to me, ours being the more vague. Basically anything showing a naked child could be considered child porn, and people have been arrested/charged/acquitted with their lives ruined for taking pictures of their children in the bathtub, running around naked, etc.