Four more people have been sentenced in Shreveport federal court for their involvement in an international criminal network organized to sexually exploit children. 63-year-old Robert Sprague of Ferndale, Washington, is the second Dreamboard child exploitation bulletin board member to receive a life sentence. Federal prosecutors say he was a high-level member of dream board -- making more than 500 posts containing hard-core child pornography. Three others sentenced this week were considered lower--to-middle level members. They each drew sentences in the twenty year range. To date, 42 out of 72 individuals have been convicted for their participation in the international child exploitation network.