A/RES/64/146 United Nations study on violence against children, 21 while promoting and ensuring country ownership and national plans and programmes in this regard, and calls upon States and institutions concerned, and invites the private sector, to provide voluntary contributions for that purpose; 20F Promoting and protecting the rights of children, including children in particularly difficult situations 14. Reaffirms paragraphs 34 to 42 of its resolution 63/241, and calls upon all States to promote and protect all human rights of all children in particularly difficult situations and to implement programmes and measures that provide them with special protection and assistance, including access to health care, education and social services, as well as, where appropriate and feasible, voluntary repatriation, reintegration, family tracing and family reunification, in particular for children who are unaccompanied, and to ensure that the best interests of the child are accorded a primary consideration; Children alleged to have infringed or recognized as having infringed penal law and children of persons alleged to have infringed or recognized as having infringed penal law 15. Also reaffirms paragraphs 43 to 47 of its resolution 63/241, and calls upon all States to respect and protect the rights of children alleged to have infringed or recognized as having infringed penal law, as well as children of persons alleged to have infringed or recognized as having infringed penal law; Prevention and eradication of the sale of children, child prostitution and child pornography 16. Further reaffirms paragraphs 48 to 50 of its resolution 63/241, and calls upon all States to prevent, criminalize, prosecute and punish all forms of sale of children, including for the purposes of transfer of organs of the child for profit, child slavery, commercial sexual exploitation of children, child prostitution and child pornography, with the aim of eradicating those practices and the use of the Internet and other information and communications technologies for these purposes, to combat the existence of a market that encourages such criminal practices and take measures to eliminate the demand that fosters them, as well as to address the needs of victims effectively and take effective measures against the criminalization of children who are victims of exploitation; 17. Welcomes the Third World Congress against Sexual Exploitation of Children and Adolescents, held in Rio de Janeiro, Brazil, from 25 to 28 November 2008, and the Rio de Janeiro Declaration and Call for Action to Prevent and Stop Sexual Exploitation of Children and Adolescents; 18. Calls upon all States to enact and enforce necessary legislative or other measures, in cooperation with relevant stakeholders, to prevent the distribution over the Internet of child pornography and including depictions of child sexual abuse, ensuring that adequate mechanisms are in place to enable reporting and removal of such material and that its creators, distributors and collectors are prosecuted as appropriate; _______________ 21 See A/61/299 and A/62/209. 5