Adding protection to DVD's

Hi
Me and my friends enjoy making our own films and putting them on DVD’s but the only problem is that we are worried they may be copied and distributed (i know silly but some of these films contain pyrotechnics wich are illegal in my country)is there any way to make it harder for these to be copied.I know that anyone with some knowledge can get past the copy-protection but i feel it may be a usefull deterant against some.

Thanks in advance.