When I copy a Document using its Copy(destinationFolderId, adminUser) method it copies the item to the destination, but it doesnt bring the public access security settings with it.  Currently I am overcoming this by manually checking on the permissions and setting them on the copied item, but I wonder if there is a way to do this as part of the copy command

For reference here is how I am copying the permissions

var copyDoc = childDoc.Copy(doc.Id, admin);
                var copyDoc = childDoc.Copy(doc.Id, admin);
                var protectionType = umbraco.cms.businesslogic.web.Access.GetProtectionType(childDoc.Id);
                if (protectionType != ProtectionType.NotProtected)
                {
                    int loginPageId = umbraco.cms.businesslogic.web.Access.GetLoginPage(childDoc.Path);
                    int errorPageId = umbraco.cms.businesslogic.web.Access.GetErrorPage(childDoc.Path);
                    umbraco.cms.businesslogic.web.Access.ProtectPage(protectionType == ProtectionType.Simple, copyDoc.Id, loginPageId, errorPageId);
                    switch (protectionType)
                    {
                        case ProtectionType.Simple:
                            var member = umbraco.cms.businesslogic.web.Access.GetAccessingMembershipUser(childDoc.Id);
                            umbraco.cms.businesslogic.web.Access.AddMembershipUserToDocument(copyDoc.Id, member.UserName);
                            break;
                        case ProtectionType.Advanced:
                            var roles = umbraco.cms.businesslogic.web.Access.GetAccessingMembershipRoles(childDoc.Id, childDoc.Path);
                            foreach (var role in roles)
                            {
                                umbraco.cms.businesslogic.web.Access.AddMembershipRoleToDocument(copyDoc.Id, role);
                            }
                            break;
                    }
                }
                copyDoc.Publish(admin);