Digital cameras and Internet distribution facilitated by the use of credit cards and the ease of transferring images across national borders has made it easier than ever before for users of child pornography to obtain the photographs and videos.[1][20] The NCMEC estimated in 2003 that 20% of all pornography traded over the Internet was child pornography, and that since 1997 the number of child pornography images available on the Internet had increased by 1500%.[20]