URGENT : how to protect DVD+R ??

[discpatient]

made some animations and mixes and burned them onto DVD+R's.. the discs got passed around and before i knew it, ppl had copies of my work !!

found out some guy was copying them using one of those multi copying towers which can copy up to 10 discs at a time !

how can i protect it from getting copied but still allow ppl to watch it through their DVD players ???

please help me !! my work is suffering because of this damn b*%±~*d

much appreciated !!