The woman, now in her twenties, lives in relative anonymity on the West Coast, but to child pornography collectors worldwide she will always be known as Vicky," a little girl raped by her father in a series of videos illegally disseminated online thousands of times during more than a decade. Now the woman and a small but growing number of other child pornography victims are seeking restitution from those who collected or traded pictures and videos depicting their abuse, filing claims for damages against convicted child pornographers in Massachusetts and around the country. In court papers, victims describe living with the knowledge that their images can never be cleansed from the Internet. Since 2008, six federal child pornography cases in Massachusetts have resulted in defendants being ordered to pay restitution, according to the US attorney's office in Boston. The amounts range between $2,000 and $2.5 million. The recent restitution efforts come as the scourge of child pornography has accelerated during the last decade, aided by improved technology and the Web's promise of anonymity. While most sexually exploited children go unidentified, nearly 5,000 nationwide have been located during the last 10 years by law enforcement officials and the National Center for Missing & Exploited Children. The Virginia nonprofit manages a database to aid prosecutors and help identify exploited children.