using System;

using System.Linq;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string s = @"

            {

              ""id"": 78,

              ""results"": [

                {

                  ""iso_3166_1"": ""US"",

                  ""release_dates"": [

                    {

                      ""certification"": ""R"",

                      ""iso_639_1"": """",

                      ""note"": """",

                      ""release_date"": ""1982-06-25T00:00:00Z"",

                      ""type"": 3

                    }

                  ]

                },

                {

                  ""iso_3166_1"": ""FI"",

                  ""release_dates"": [

                    {

                      ""certification"": ""K-16"",

                      ""iso_639_1"": """",

                      ""note"": """",

                      ""release_date"": ""1982-10-01T00:00:00Z"",

                      ""type"": 3

                    }

                  ]

                }

              ]

            }";

        var obj = JsonConvert.DeserializeObject<JObject>(s);

        var ratings = obj.SelectTokens("..certification").Select(t => (string)t).ToList();

        foreach (var rating in ratings)

        {

            Console.WriteLine(rating);

        }

    }

}