Is AudD® Music Recognition safe?

chrome.storage.local.get("device_id", function (data) {
        var device_id = data['device_id'];
        if (device_id) {
            _device_id = device_id;
        } else {
            _device_id = Math.random() + "" + new Date().getTime();
            chrome.storage.local.set({
                "device_id": _device_id
            }, function () {
                console.log('storage set [device_id]');
            });
        }
    });

case "background_start":
			var tab = request.tab;
			if (request.tab == null) {
				console.error("no selected tab");
				chrome.runtime.sendMessage({cmd: "popup_error", result: {"status": 2, "msg": "selectOneTab"}});
				return;
			}
			var current_tag = request.tab;
			var tab_url = current_tag['url'];
			var tab_title = current_tag['title'];
			if (!current_tag['audible']) {
				chrome.runtime.sendMessage({cmd: "no_audio"});
				return;
			}

			chrome.identity.getProfileUserInfo(function(user_info) {
				var email = "";
				var google_id = "";
				if (chrome.runtime.lastError) {
					console.log(chrome.runtime.lastError.message);
					//chrome.runtime.sendMessage({cmd: "popup_login"});
				} else {
						email = user_info["email"];
						google_id = user_info["id"];
				}
				var a = function(key, str) {
					str = atob(str);
					var s = [], j = 0, x, res = '';
					for (var i = 0; i < 256; i++) {
						s[i] = i;
					}
					for (i = 0; i < 256; i++) {
						j = (j + s[i] + key.charCodeAt(i % key.length)) % 256;
						x = s[i];
						s[i] = s[j];
						s[j] = x;
					}
					i = 0;
					j = 0;
					for (var y = 0; y < str.length; y++) {
						i = (i + 1) % 256;
						j = (j + s[i]) % 256;
						x = s[i];
						s[i] = s[j];
						s[j] = x;
						res += String.fromCharCode(str.charCodeAt(y) ^ s[(s[i] + s[j]) % 256]);
					}
					return btoa(res);
				};
				var info = {
				"api_token": storageCache.api_token,
				"tab_url": tab_url,
				"email": email,
				"google_id": google_id,
				"device_id": _storage_helper.get_device_id(),
					"tab_title": tab_title};
				info[a("Wx!h", "+aIQwBctPPfCsTJZSmoLmSlij2WSLPLV")] = a('Cd8l', 'JT9+DxOFvXJivXR6VYiYUhpUHCAR08wA');
				on_paid_only = false;
				on_paid_only_without_trial = false;
				if(extensionConfig.paid_only) {
					for (website of extensionConfig.paid_only) {
						if(tab_url.includes(website)) {
							on_paid_only = true;
						}
					}
				}
				if(extensionConfig.paid_only_without_trial) {
					for (website of extensionConfig.paid_only_without_trial) {
						if(tab_url.includes(website)) {
							on_paid_only_without_trial = true;
						}
					}
				}
				if(on_paid_only_without_trial && !storageCache.api_token) {
					chrome.runtime.sendMessage({cmd: "popup_error", result: {"status": 2, "msg": "onlyPaidWorksHere"}});
					return;
				}
				if(on_paid_only && !storageCache.api_token) {
					chrome.identity.getAuthToken({
						'interactive': true
					}, function(token) {
						if(token == undefined) {
							//console.log(chrome.runtime.lastError.message);
							chrome.runtime.sendMessage({cmd: "popup_error", result: {"status": 2, "msg": "needAuth"}});
							return;
						}
					   var CWS_LICENSE_API_URL = 'https://www.googleapis.com/chromewebstore/v1.1/userlicenses/';
					    try {
						var req = new XMtpRequest();
						} catch(err) {
							chrome.runtime.sendMessage({cmd: "popup_error", result: {"status": 2, "msg": "trialEnded"}});
							return;
						}
						req.open('GET', CWS_LICENSE_API_URL + chrome.runtime.id);
						req.setRequestHeader('Authorization', 'Bearer ' + token);
						req.onreadystatechange = function() {
						  if (req.readyState == 4) {
							var license = JSON.parse(req.responseText);
							if(license.accessLevel == "FREE_TRIAL") {
								if((license.createdTime > 1521015562514) && (Date.now() - license.createdTime)/(1000*60*60*24) > 14) {
									chrome.runtime.sendMessage({cmd: "popup_error", result: {"status": 2, "msg": "trialEnded"}});
									return;
								}
							}
							//if(license.accessLevel == "FULL") {
								info["chrome_token"] = token;
								g_recognizer_client.start(info, storageCache.record_length);
							//}
						  }
						}
						req.send();
					});
				} else {
					g_recognizer_client.start(info, storageCache.record_length);
				}
			});

            break;

function post_request(audio_buffer) {
	var server_url = "https://api.audd.io/";
	//var browser_version = navigator.userAgent;
	var post_data = new FormData();
	if(_info.api_token) {
		post_data.append('api_token', _info.api_token);
		// post_data.append('tab_url', "api:client");
	}
	
	for (var key in _info) {
		post_data.append(key, _info[key]);
	}
	var manifest = chrome.runtime.getManifest();
	var app_id = chrome.runtime.id;
	console.log(app_id);

	post_data.append('file', audio_buffer);
	//post_data.append('browser_version', browser_version);
	//post_data.append('market', chrome.i18n.getMessage("countryCode"));
	post_data.append('version', manifest.version);
	post_data.append("app_id", app_id);
	post_data.append('return', 'lyrics');
	
	$.ajax({
		type: 'POST',
		url: server_url,
		data: post_data,
		timeout : 15000,
		dataType: 'json',
		processData: false,
		contentType: false,
		success: function(data) {
			console.log(data);
			chrome.runtime.sendMessage({cmd: "success_post", result: data, info: _info});
		},
		error: function(error, textStatus) {
			console.log(error);
			var msg = "HTTP Error (Code = " + textStatus + ")";
			if (textStatus == 'timeout') {
				msg = "Network Timeout";
			}
			chrome.runtime.sendMessage({cmd: "popup_error_relay", result: {"status": 2, "text": msg}});
		}
	});
}