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So we think by decoupling the key loading from media loading or even the playback, we'll be able to provide you more flexibility that can be exploited to address some of the existence pain points and also provide better user experience.

So with all these things in mind we are so glad to introduce a new API that will allow you to better manage and deliver content decryption keys. It allows you to decouple key loading from media loading or even playback, for that matter. And it also gives you a better control over the lifecycle of content decryption keys. So if you recall, your application loads keys only when it receives a key request from AVFoundation and but that -- you can change that with AVContentKeySession.

However, if you choose not to load keys before requesting playback, AVFoundation still sends you a key request on demand like it does today. So now we provide you two ways to trigger the key loading process. You could use -- your application could use AVContentKeySession to explicitly initiate the key loading process, or AVFoundation initiates the key loading process on demand when it sees the content is encrypted.

And the first, use keys that I have for you today is around playback startup. Key loading time could be a significant portion of your playback startup time because applications normally load keys when they receive an on-demand key request. You could improve the playback startup experience your user receives if you could load keys even before the user has picked something to play. So you could use AVContentKeySession to initiate a key loading process and then use the key request that you get to load the keys independent of the playback session.

Now we call this key preloading and after loading the keys you could request a playback so during playback you don't have to load any keys, and the playback -- the decryption could start immediately. The second use case I have for you today is gaining a lot of prominence day by day and it is around live playback. We have seen an explosion in the amount of live content that delivered on our platforms, thanks to a more immersive and integrated experience users receive on our devices.

With more users looking to consume sports and other live events on our devices, developers are using more advanced content production features like key rotation and key renewal to add an extra layer of protection while delivering premium live content. Due to the nature of live streaming, your keys servers get bombarded with millions of key requests all at once when the keys are being rotated or renewed. Well, you could use AVContentKeySession to alleviate the situation by load balancing key requests at the point of origin.

Let me explain how you could do this with a simple illustration here. Consider the scenario in which millions of users are watching a popular live stream like Apple's Keynote. It's possible that they all started at different points in time but when it's time to renew or update the key they all send requests to your key server at the exact same time.

That presents a huge load on the key server for a short duration of time and then things get back to normal, until it's time to renew or update the key again, right? So this pattern continues leading to input load on your key serer. You could use AVContentKeySession to spread out key requests by picking like a random point within a small time window before the key actually expires and initiating the key loading yourself.

So what this allows you to do is scale your live offering without having to throw mode or of your key server. So now that we have seen some use cases where initiating key loading process with AVContentKeySession was helpful, let's see how to do it in terms of code. You could initiate a key loading process which is three lines of code, it's that simple, and here it is.

You then set up your app as a contentKeySession Delegate. You should expect to receive all delegate callbacks on the delegate queue that you specify here. The third step is to invoke processContentKeyRequest method and that will initiate the key loading process.

So have to note a couple of things here. There are no changes required in your keys or your key server module implementation in order to use this feature. This is -- all implementation here is on the client side which is great. Second, the identifier that you specify here should match with the identifier that you specify in your EXT-X-KEY tag in your media playlist.

What that allows us to do is match the keys that you loaded here with the keys that you would request during playback. And third, you should have an out-of-band process to obtain the keys for a particular asset from your key server so that you could load all these keys at this point. So you have to keep a couple of things in mind while responding to a key request.

As soon as you set the CKC as a response to the key request, you would consume a secure decrypt slot on the device and there are a limited number of those. So it's okay to initiate key loading process for any number of keys and you can obtain the CKC's as well for all those different key requests, but be careful with the last step.

You should set CKCs on only those keys that you predict might be used during playback, and do it just before you request a playback. AVContentKeySession could be used to create persistent keys as well. Before requesting the download of HLS assets, you could use AVContentKeySession to initiate key loading process and use the key request object to create persistent keys.

Then you could store the persistent keys in your app storage for future use. With that, this will make your workflow a little bit simpler because now you don't have to define the EXT-X Session keys in your master playlist and so on, you could just use AVContentKeySession. So if you recall, this is the delegate method that gets called when you initiate a key loading process. At this point, if you're trying to create a persistent key you should just respond to the key request and request for PersistableContentKeyRequest, and we would send you an AVPersistableContentKeyRequest object through a new delegate callback.

When it's time to use the persistent key, all you have to do is create a response object with the persistent key data blob and set that as a response on the ContentKeyRequest object. However, that is a key difference. Well, to be consistent we enforce that all content decryption keys are loaded exclusively with AVContentKeySession delegate.

So your AVAssetResourceLoader delegate receives all resource loading requests including those four content decryption keys. The app is expected to just defer all the content decryption key loading by calling finish loading on the loading request so AVFoundation could re allow the request to the AVContentKeySession delegate. Let me show you how to do that in code. It's really simple. So here's a delegate method that gets called when AVFoundation is trying to load a resource, and when you see that the resource is for a content decryption key you should just set the content pipe to say that it's a content key and call finish loading.

If it's any other resource you could just continue loading the resource here. We are providing double expiry windows support for FairPlay Streaming persistent keys. Now, what does this double expiry window thing? If you've ever rented a movie on iTunes you would see that you have -- once you rent a movie you have 30 days to watch it.

And once you start watching the moving you have 24 hours to finish it. We call this dual expiry window model for rentals. So what this feature allows you to do is define and customize two expiry windows for FairPlay Streaming persistent keys. That will allow you to support items like rental feature without much engineering effort on the silver side and the best thing is it works on both offline and online playback. So in order to use this feature, you have to first opt in by sending suitable descriptor in CKC and that will allow you to specify two expiry windows.

The first one is called a storage expiry window which starts as soon as the persistent key is created, and then we have a playback expiry window which starts when the persistent key is used to start the playback. To explain this feature better let me just give you -- let me just take you over a timeline of events and the context of offline playback.

When the user rents a movie to play offline you would create a persistent key with a CKC that opts in to use this feature. This persistent key is said to expire at the end of storage expiry window which was 30 days from our example. You would typically store this persistent key in your apps storage and use it to answer a key request later on.

Now when the user comes back within these 30 days and asks you to start play -- ask you to play the content, you will get a key request and you would use this persistent key to answer the key request. At that point, we will send you an updated persistent key which is set to expire at the end of playback experiment which was 24 hours from our example. Along with that we'll also explicitly expire the original persistent key that you've created, so you're expected to save the updated persistent key in your app storage and use that to answer future key loading requests.

That is when the user stops and resumes playback within the next 24 hours. In terms of code this is very similar to the persistent key workflow that we just saw a few slides ago, however, we'll send you this new updated persistent key through a new AVContentKeySession delegate callback. So those were all the enhancements that we had for FairPlay Streaming key delivery process this year. And finally, we added dual expiry window support for all FairPlay Streaming persistent keys so that will allow you to support rental model with your offline HLS assets.

It was really exciting for all of us to work on these new features and we look forward to the adoption. Thanks a lot for attending this session. You can get more information by visiting our session page on the developer site. You can also download all the sample code for different things that we covered during this talk. Chemicals EP.

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