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Progressive PlayList
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A great feature introduced by BD-Live is called Progressive PlayList The intent is to allow AV streams delivered from the network to start playing before the entire stream is downloaded A user does not have to wait until the entire stream is downloaded before it can be watched The playback can begin as soon as a minimum amount of data is transferred into a local buffer, while the rest of the stream continues to download in the background This kind of functionality is very common to Internet downloads that provide pseudo-streaming experiences using progressive downloads In Blu-ray, this is implemented by using a virtual asset (a Progressive PlayList) that is similar in structure to a regular PlayList in the sense that it contains multiple PlayItems and references AV stream data However, it differs in the way that it allows playback to start before all assets are available Because a PlayList is divided into multiple PlayItems, the playback can start once the first PlayItem is successfully downloaded While the playback starts, the remaining Playitems continue downloading in the background As additional PlayItems become available, they are enabled for playback It only depends on the download speed to determine whether or not the playback will be seamless If the download speed is too slow, the playback will pause at the end of a PlayItem until the next item is available, at which point the playback continues
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If a BD-J application is attempting to perform an operation that is beyond a self-contained sandbox , meaning it needs to interact with other parts of the disc or with other applications jumping to titles, starting and stopping other applications, reading and writing to local storage, using the virtual file system, or accessing the network an authentication process is necessary This authentication process is called application signing and the permissions of every application are defined in the Permission Request File (PRF) The PRF contains information about which area of the local storage can be accessed, or which network ports the player may connect to The application signing is not a content protection mechanism but instead provides an authentication procedure to ensure that the content on the disc has not been altered and is indeed allowed to access other content located in local storage or on a network server The way this works is that each application is signed and a PRF, as well as the corresponding certificate, is attached to it The certificate is authenticated against a disc root certificate through a certificate chain The disc root certificate is authenticated through AACS This allows scenarios where different parties may create individual parts of the disc In this case, each party signs their own application and creates their own PRF, and the authoring studio putting it all together incorporates all of the applications with the signatures and PRFs to create the disc with their own root certificate As the next step, a SHA-1 hash4 of the root certificate is generated that is incorporated into the master AACS List as part of the encryption process As a result, whenever a disc is inserted into a player, the hash of the root certificate contained on the disc is calculated by the player and compared against the hash in the AACS list If the content has not been modified, the hash values will match and the application will load Figure 619 outlines the workflow scenario for application signing including multiple application developers and the use of content from different locations disc, local storage, and the network The root certificate is also an important piece when it comes to managing the local storage in a player As one could imagine, having a lot of discs accessing the same storage area can make it difficult to manage that space and will most likely come to naming conflicts if the space is not managed properly As such, Blu-ray implemented a directory structure that allows sharing the common storage space The idea is to have multiple layers of directories that differentiate between studios (content owners), producers (authoring facilities), and discs The root certificate is used to differentiate between studios Each studio should have their own root certificate that it carefully manages, and each studio should issue leaf certificates to every authoring vendor they are using Hence, every disc created by Studio A will be based on the same root certificate, regardless of the authoring studio As a second security step, the
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4SHA is shorthand for Secure Hash Algorithm A SHA-1 hash is a cryptographic signature for a text or a data file It is sometimes called a digest A hash is not encryption, as it cannot be decrypted back to the original file content It is a one-way cryptographic function It is a process that may be used to validate passwords, authenticate handshakes , verify digital signatures of files, et cetera
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