Java YouTube数据API超出未经验证使用的每日限制

以下是获取数据的代码：

YouTube youtube = new YouTube.Builder(new NetHttpTransport(), new JacksonFactory(), new HttpRequestInitializer() {
    public void initialize(HttpRequest request) throws IOException {}
}).setApplicationName("youtube-channel-fetcher").build();
String artist = "";
try{
    artist = youtube.videos().list("snippet").setId(ytID).setKey(Utils.getYouTubeKey()).setFields("items(snippet/channelTitle)").execute().getItems().get(0).getSnippet().getChannelTitle();
} catch (ArrayIndexOutOfBoundsException ignored){}

作为响应，我得到以下错误：

"code" : 403,
"errors" : [ {
"domain" : "usageLimits",
"message" : "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup.",
"reason" : "dailyLimitExceededUnreg",
"extendedHelp" : "https://code.google.com/apis/console"
} ],
"message" : "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup."

---

当我使用这个应用程序时，它对我做了同样的事情，直到我注册。一旦我这样做了，错误就消失了。我认为应用程序中的键不起作用