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iOS Privacy and Opt-Out: Difference between revisions

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== Privacy and Opt-Out ==
== Privacy and Opt-Out ==
There are two primary methods for implementing user Opt-out preferences:
# '''[[#OS-level_Opt-out|OS-level Opt-out]]''' - managed by ''Limit Ad Tracking'' setting on device ('''preferred approach''').
# '''[[#User Choice|User Choice]]''' - Direct call to SDK. Can be used without the Ad Framework


=== OS-level Opt-out ===
There are currently 3 flavors of the Nielsen SDK. Please check the "Implementation" section for a comparison of the three flavors. Implementing opt-out for the three flavors are different:
# '''[[#Global_iOS_SDK_Opt-out|Global iOS SDK Opt-out]]''' - managed by ''AppTracking'' or ''Limit Ad Tracking'' setting on device.
# '''[[#Global_iOS_SDK_No_Ad_Framework_Opt-out|Global iOS SDK No Ad Framework Opt-out]]''' - Direct call to SDK. Can be used without the Ad Framework.
# '''[[#Global_iOS_SDK_No_ID_Opt-out|Global iOS SDK No ID Opt-out]]''' - Direct call to SDK. Should be used for Kids Category.
__NOTOC__
=== Global iOS SDK Opt-out ===
''OS-level Opt-out'' method available on Nielsen iOS  
''OS-level Opt-out'' method available on Nielsen iOS  


The Nielsen SDK automatically leverages the iOS's ''Limit Ad Tracking'' setting. The user is opted out of demographic measurement if the OS-level ''"Limit Ad Tracking"'' setting is ''enabled''. As a publisher, you cannot override this setting.
The Nielsen SDK automatically leverages the iOS's '''Limit Ad Tracking''' or '''AppTracking''' setting.  
*  If the User's device is running < iOS 13.x, the Nielsen SDK will check the status of '''Limit Ad Tracking'''.
*  iOS14 modifies the way Apple manages the collection of a User's Opt-In status through '''AppTracking'''. Starting with Version 8.x+, the Nielsen App SDK will check the iOS version during initialization. If the device is running iOS12 or iOS13, the Limit Ad Tracking setting is requested. If iOS14.x +, then AppTracking is utilized.
==== Webview Element ====
It is a requirement to display a WebView element whose loadUrl is set to the value obtained from optOutURL.
If using the Global iOS SDK, this optOutURL informs the user how to deactivate/activate “App Tracking/Limit Ad Tracking”.


=== User Choice ===
The ''User Choice'' method can be used without the Ad Framework, or in situations where the publisher does not wish to use the [https://developer.apple.com/documentation/apptrackingtransparency App Tracking Transparency Framework].


==== The User Choice opt-out method works as follows: ====
If you are implementing on AppleTV here are your Opt Out verbiage options : https://engineeringportal.nielsen.com/docs/DCR_Video_%26_Static_CTV_Device_SDK_Privacy
 
==== Sample Code for Global Build ====
===== Swift =====
<syntaxhighlight lang="swift">
import UIKit
import WebKit
import NielsenAppApi
 
class OptOutVC: UIViewController, NielsenAppApiDelegate, WKNavigationDelegate {
    var nielsenApi : NielsenAppApi!
    var webView: WKWebView!
 
    override func loadView() {
        webView = WKWebView()
        webView.navigationDelegate = self
        view = webView
    }
 
    override func viewDidLoad() {
        super.viewDidLoad()
 
    if let appApi = self.nielsenApi {
            //Getting the optPut URL from SDK
            if let url = URL(string: appApi.optOutURL) {
                webView.load(URLRequest(url: url))
                webView.allowsBackForwardNavigationGestures = true
            }}}
 
        func closeOptOutView() {
            self.dismiss(animated: true, completion: nil)
        }}
</syntaxhighlight>
 
===== Objective-C =====
<syntaxhighlight lang="objective-c">
 
#import "OptOutVC.h"
#import "NielsenInit.h"
#import <NielsenAppApi/NielsenAppApi.h>
 
@interface OptOutVC ()
 
@property (weak, nonatomic) IBOutlet UIWebView *webView;
@end
 
@implementation OptOutVC
 
- (void)viewDidLoad {
    [super viewDidLoad];
 
- (void)viewDidLoad {
    [super viewDidLoad];
    //Getting the optPut URL from eventTracker
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL
URLWithString:self.nielsenApi.optOutURL]]];
}}
 
 
</syntaxhighlight>
 
=== Global iOS SDK No Ad Framework Opt-out ===
The ''User Choice'' method can be used without the Ad Framework, or in situations where the publisher does not wish to use the [https://developer.apple.com/documentation/apptrackingtransparency App Tracking Transparency Framework]. As this flavor of the Nielsen SDK does not use the Ad Framework, so it is necessary to display an Optout Page to the user and capture their selection.
 
Similar to the Global iOS SDK Flavor, it is a requirement to display a WebView element whose loadUrl is set to the
value obtained from optOutURL. This is a special URL that indicates Opt-in, or Opt-out and close the WebView.  '''The steps are as follows:'''
 
* Get the Nielsen opt-out URL via [[optOutURL]]
* Get the Nielsen opt-out URL via [[optOutURL]]
* Display a WebView element whose loadUrl is set to the value obtained from [[optOutURL]]
* Display a WebView element whose loadUrl is set to the value obtained from [[optOutURL]]
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** Example: <syntaxhighlight lang=swift>NielsenAppApi?.userOptOut("nielsenappsdk://1"); // User opt-out</syntaxhighlight>
** Example: <syntaxhighlight lang=swift>NielsenAppApi?.userOptOut("nielsenappsdk://1"); // User opt-out</syntaxhighlight>


==== Legacy Opt-out example code ====
==== Sample code for No Ad Framework Build ====
{{ExampleCode|
===== Swift =====
|Objective C = <syntaxhighlight lang="objective-c">
<syntaxhighlight lang="swift">
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
import UIKit
import WebKit
import NielsenAppApi
 
class OptOutVC: UIViewController, NielsenAppApiDelegate, WKNavigationDelegate {
    var nielsenApi : NielsenAppApi!
    var webView: WKWebView!
 
    override func loadView() {
        webView = WKWebView()
        webView.navigationDelegate = self
        view = webView
    }
 
    override func viewDidLoad() {
        super.viewDidLoad()
 
        if let appApi = self.nielsenApi {
            //Getting the optPut URL from SDK
            if let url = URL(string: appApi.optOutURL) {
                webView.load(URLRequest(url: url))
                webView.allowsBackForwardNavigationGestures = true
            }}}
 
        func closeOptOutView() {
            self.dismiss(animated: true, completion: nil)
        }
 
        func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler:
@escaping (WKNavigationActionPolicy) -> Void) {
            print(navigationAction.request.url?.absoluteString as Any) //For debugging to check what is being passed from webpage.
            if navigationAction.request.url?.absoluteString == "nielsen://close" {
                closeOptOutView()
                decisionHandler(.cancel)
            } else {
                if let url = navigationAction.request.url?.absoluteString, url.hasPrefix("nielsen") {
                    nielsenApi?.userOptOut(url). //either nielsenappsdk://1 or nielsenappsdk://0
                    decisionHandler(.cancel)
                } else {
                    if navigationAction.navigationType == .linkActivated {
                        if let url = navigationAction.request.url?.absoluteString, url.hasSuffix("#") {
                            decisionHandler(.allow)
                        } else {
                            decisionHandler(.cancel)
                            webView.load(navigationAction.request)
                        }
                    } else {
                        decisionHandler(.allow)
                    }}}}


    NSURLRequest *request = [navigationAction request];
    NSString *url = [[request URL]absoluteString];
   
    if([url isEqualToString:self.NIELSEN_URL_OPT_OUT] || [url isEqualToString:self.NIELSEN_URL_OPT_IN]){
        [self.nielsenApi userOptOut:url];
        decisionHandler(WKNavigationActionPolicyAllow);
    }else{
        decisionHandler(WKNavigationActionPolicyCancel);
    }       
}
}
</syntaxhighlight>
</syntaxhighlight>
|Swift = <syntaxhighlight lang="swift">


var webView: WKWebView!
===== Objective-C =====
var NIELSEN_URL_OPT_OUT : String = "nielsenappsdk://1"
<syntaxhighlight lang="objective-c">
var NIELSEN_URL_OPT_IN : String = "nielsenappsdk://0"


func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
#import "OptOutVC.h"
#import "NielsenInit.h"
#import <NielsenAppApi/NielsenAppApi.h>


      let urlStr = navigationAction.request.url?.absoluteString
@interface OptOutVC ()


         if(urlStr == NIELSEN_URL_OPT_OUT || urlStr == NIELSEN_URL_OPT_IN){
@property (weak, nonatomic) IBOutlet UIWebView *webView;
             let appApi = self.nielsenApi
@end
             appApi?.userOptOut(urlStr)
 
            decisionHandler(.allow)
@implementation OptOutVC
 
- (void)viewDidLoad {
    [super viewDidLoad];
 
- (void)viewDidLoad {
    [super viewDidLoad];
    //Getting the optPut URL from eventTracker
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL
URLWithString:self.nielsenApi.optOutURL]]];
}
   
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction
decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    if ([navigationAction.request.URL.absoluteString isEqualToString:kNielsenWebClose])
    {  [self performSelector:@selector(closeOptOutView) withObject:nil afterDelay:0];
        decisionHandler(WKNavigationActionPolicyCancel);
    } else {
         if ([navigationAction.request.URL.absoluteString hasPrefix:@"nielsen"])
        {[self.nielsenAppApi userOptOut:navigationAction.request.URL.absoluteString];
            decisionHandler(WKNavigationActionPolicyCancel);
        } else {
             if (navigationAction.navigationType == WKNavigationTypeLinkActivated)
             { if ([navigationAction.request.URL.absoluteString hasSuffix:@"#"])
                      {decisionHandler(WKNavigationActionPolicyAllow);
                } else {
                    decisionHandler(WKNavigationActionPolicyCancel);
                    [webView loadRequest:[NSURLRequest requestWithURL:navigationAction.request.URL]];
                }} else {
                decisionHandler(WKNavigationActionPolicyAllow);
            }}}
}


        }else{
          decisionHandler(.cancel)
        }
    }
</syntaxhighlight>
</syntaxhighlight>
}}


=== Retrieve current Opt-Out preference ===
Whether the user is opted out via OS-level Opt-out or via App-level Opt-out, the current Opt-Out status as detected by the SDK is available via the [[optOutStatus]] property in the Nielsen SDK API


=== Required Privacy Links ===
=== Global iOS SDK No ID Opt-out ===
Users must either have access to the "About Nielsen Measurement" page, or have similar text available within the native app. Include "About Nielsen Measurement" and "Your Choices" link in the Privacy Policy / EULA or as a button near the link to the app's Privacy Policy.
If you are building an app that will be listed in the Kids Category:
#  Ensure that you are using the [https://nielsendownloads-green.digitalengsdk.com/digital/Nielsen-iOS-App-SDK-GlobalNoId_latest.zip NoID version] of the Nielsen SDK Framework.
#  Immediately following the initialization of the Nielsen SDK ensure you call the userOptOut API with Opt out selection:
<syntaxhighlight lang=swift>NielsenAppApi?.userOptOut("nielsenappsdk://1"); // User opt-out</syntaxhighlight>


In addition, the following text must be included in your app store description.
== Retrieve current Opt-Out preference ==
<blockquote>
Whether the user is opted out via OS-level Opt-out or via User Choice Opt-out, the current Opt-Out status as detected by the SDK is available via the [[optOutStatus]] property in the Nielsen SDK API
'''"Please note: This app features Nielsen’s proprietary measurement software which contributes to market research, like Nielsen’s TV Ratings. Please see https://priv-policy.imrworldwide.com/priv/mobile/us/en/optout.html for more information"'''</blockquote>
<syntaxhighlight lang="objective-c">
@property (readonly) BOOL optOutStatus
</syntaxhighlight>

Latest revision as of 18:24, 4 April 2023

Privacy and Opt-Out

There are currently 3 flavors of the Nielsen SDK. Please check the "Implementation" section for a comparison of the three flavors. Implementing opt-out for the three flavors are different:

  1. Global iOS SDK Opt-out - managed by AppTracking or Limit Ad Tracking setting on device.
  2. Global iOS SDK No Ad Framework Opt-out - Direct call to SDK. Can be used without the Ad Framework.
  3. Global iOS SDK No ID Opt-out - Direct call to SDK. Should be used for Kids Category.

Global iOS SDK Opt-out

OS-level Opt-out method available on Nielsen iOS

The Nielsen SDK automatically leverages the iOS's Limit Ad Tracking or AppTracking setting.

  • If the User's device is running < iOS 13.x, the Nielsen SDK will check the status of Limit Ad Tracking.
  • iOS14 modifies the way Apple manages the collection of a User's Opt-In status through AppTracking. Starting with Version 8.x+, the Nielsen App SDK will check the iOS version during initialization. If the device is running iOS12 or iOS13, the Limit Ad Tracking setting is requested. If iOS14.x +, then AppTracking is utilized.

Webview Element

It is a requirement to display a WebView element whose loadUrl is set to the value obtained from optOutURL. If using the Global iOS SDK, this optOutURL informs the user how to deactivate/activate “App Tracking/Limit Ad Tracking”.


If you are implementing on AppleTV here are your Opt Out verbiage options : https://engineeringportal.nielsen.com/docs/DCR_Video_%26_Static_CTV_Device_SDK_Privacy

Sample Code for Global Build

Swift
import UIKit
import WebKit
import NielsenAppApi

class OptOutVC: UIViewController, NielsenAppApiDelegate, WKNavigationDelegate {
    var nielsenApi : NielsenAppApi!
    var webView: WKWebView!
   
    override func loadView() {
        webView = WKWebView()
        webView.navigationDelegate = self
        view = webView
    }

    override func viewDidLoad() {
        super.viewDidLoad()

    if let appApi = self.nielsenApi {
            //Getting the optPut URL from SDK
            if let url = URL(string: appApi.optOutURL) {
                webView.load(URLRequest(url: url))
                webView.allowsBackForwardNavigationGestures = true
            }}}

        func closeOptOutView() {
            self.dismiss(animated: true, completion: nil)
        }}
Objective-C
#import "OptOutVC.h"
#import "NielsenInit.h"
#import <NielsenAppApi/NielsenAppApi.h>

@interface OptOutVC ()

@property (weak, nonatomic) IBOutlet UIWebView *webView;
@end

@implementation OptOutVC

- (void)viewDidLoad {
    [super viewDidLoad];

- (void)viewDidLoad {
    [super viewDidLoad];
    //Getting the optPut URL from eventTracker
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL
 URLWithString:self.nielsenApi.optOutURL]]];
}}

Global iOS SDK No Ad Framework Opt-out

The User Choice method can be used without the Ad Framework, or in situations where the publisher does not wish to use the App Tracking Transparency Framework. As this flavor of the Nielsen SDK does not use the Ad Framework, so it is necessary to display an Optout Page to the user and capture their selection.

Similar to the Global iOS SDK Flavor, it is a requirement to display a WebView element whose loadUrl is set to the value obtained from optOutURL. This is a special URL that indicates Opt-in, or Opt-out and close the WebView. The steps are as follows:

  • Get the Nielsen opt-out URL via optOutURL
  • Display a WebView element whose loadUrl is set to the value obtained from optOutURL
  • Detect if the WebView URL changes to a special URL that indicates Opt-in, or Opt-out and close the WebView
    • Opt-out if the WebView URL = nielsenappsdk://1
    • Opt-in if the WebView URL = nielsenappsdk://0
  • Pass the detected URL to the userOptOut function
    • Example:
      NielsenAppApi?.userOptOut("nielsenappsdk://1"); // User opt-out
      

Sample code for No Ad Framework Build

Swift
import UIKit
import WebKit
import NielsenAppApi

class OptOutVC: UIViewController, NielsenAppApiDelegate, WKNavigationDelegate {
    var nielsenApi : NielsenAppApi!
    var webView: WKWebView!
   
    override func loadView() {
        webView = WKWebView()
        webView.navigationDelegate = self
        view = webView
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        if let appApi = self.nielsenApi {
            //Getting the optPut URL from SDK
            if let url = URL(string: appApi.optOutURL) {
                webView.load(URLRequest(url: url))
                webView.allowsBackForwardNavigationGestures = true
            }}}

        func closeOptOutView() {
            self.dismiss(animated: true, completion: nil)
        }

        func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: 
@escaping (WKNavigationActionPolicy) -> Void) {
            print(navigationAction.request.url?.absoluteString as Any) //For debugging to check what is being passed from webpage.
            if navigationAction.request.url?.absoluteString == "nielsen://close" {
                closeOptOutView()
                decisionHandler(.cancel)
            } else {
                if let url = navigationAction.request.url?.absoluteString, url.hasPrefix("nielsen") {
                    nielsenApi?.userOptOut(url). //either nielsenappsdk://1 or nielsenappsdk://0
                    decisionHandler(.cancel)
                } else {
                    if navigationAction.navigationType == .linkActivated {
                        if let url = navigationAction.request.url?.absoluteString, url.hasSuffix("#") {
                            decisionHandler(.allow)
                        } else {
                            decisionHandler(.cancel)
                            webView.load(navigationAction.request)
                        }
                    } else {
                        decisionHandler(.allow)
                    }}}}

}
Objective-C
#import "OptOutVC.h"
#import "NielsenInit.h"
#import <NielsenAppApi/NielsenAppApi.h>

@interface OptOutVC ()

@property (weak, nonatomic) IBOutlet UIWebView *webView;
@end

@implementation OptOutVC

- (void)viewDidLoad {
    [super viewDidLoad];

- (void)viewDidLoad {
    [super viewDidLoad];
    //Getting the optPut URL from eventTracker
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL
 URLWithString:self.nielsenApi.optOutURL]]];
}
     
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction
 decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    if ([navigationAction.request.URL.absoluteString isEqualToString:kNielsenWebClose])
    {   [self performSelector:@selector(closeOptOutView) withObject:nil afterDelay:0];
        decisionHandler(WKNavigationActionPolicyCancel); 
     } else {
        if ([navigationAction.request.URL.absoluteString hasPrefix:@"nielsen"])
        {[self.nielsenAppApi userOptOut:navigationAction.request.URL.absoluteString];
            decisionHandler(WKNavigationActionPolicyCancel); 
        } else {
            if (navigationAction.navigationType == WKNavigationTypeLinkActivated) 
            { if ([navigationAction.request.URL.absoluteString hasSuffix:@"#"]) 
                      {decisionHandler(WKNavigationActionPolicyAllow);
                } else {
                    decisionHandler(WKNavigationActionPolicyCancel);
                    [webView loadRequest:[NSURLRequest requestWithURL:navigationAction.request.URL]];
                }} else {
                 decisionHandler(WKNavigationActionPolicyAllow);
            }}}
}


Global iOS SDK No ID Opt-out

If you are building an app that will be listed in the Kids Category:

  1. Ensure that you are using the NoID version of the Nielsen SDK Framework.
  2. Immediately following the initialization of the Nielsen SDK ensure you call the userOptOut API with Opt out selection:
NielsenAppApi?.userOptOut("nielsenappsdk://1"); // User opt-out

Retrieve current Opt-Out preference

Whether the user is opted out via OS-level Opt-out or via User Choice Opt-out, the current Opt-Out status as detected by the SDK is available via the optOutStatus property in the Nielsen SDK API

@property (readonly) BOOL optOutStatus