Apple wants to protect your audio, video data
TweetFollow Us on Twitter

Apple wants to protect your audio, video data

An Apple patent (number 20120281828) for the protection of audio or video in a playback device has appeared at the U.S. Patent & Trademark Office. It involves a method and apparatus to prevent hacking of encrypted audio or video content during playback.

Hackers, using a debugging attachment or other tools, can illicitly access encrypted data in memory in a playback device when the data is decrypted during playback and momentarily stored in digital form. This hacking is defeated here by methodically "poisoning" the encrypted data so that it is no longer playable by a standard decoder.

The poisoning involves deliberate alteration of certain bit values. On playback, the player invokes a special secure routine that provides correction of the poisoned bit values, for successful playback.

Here's Apple's background on the invention: "The protection of digital content transferred between computers over a network and transferred from a computer to an associated playback device is important for many organizations. The DRM process often involves encrypting the pieces of content (e.g., encr the binary form of the content) to restrict usage to those who have been granted a right to the content, which is typically pieces of music or video programs.

"Cryptography is the traditional protection method, but for many digital file transfer situations, a party that legitimately receives the content might try to break the DRM protection scheme, so as to give illicit access to third parties. An identified weak leak in the DRM security is in the overall process, rather than the encryption scheme. For instance, one of the more successful DRM systems distributes music and video content via the Internet.

"The DRM system distributes to a user's computer content that has been encrypted. The user's computer then decrypts the received content, generates local keys for encrypting the content, and uses these local keys to re-encrypt the content. Typically the content in encrypted form may also be downloaded, via a local connection, to an associated playback-only device such as an audio or video media player, which similarly decrypts and re-encrypts the content before playing same.

"The present inventors have identified a potential security issue with this approach. As indicated above, during the playback process (which can also occur in the user's computer) the decrypted data is resident for a time in memory in the host computer and/or other playback device. One such memory location is a buffer memory which temporarily stores one or more packets or frames of the decrypted content bitstream. For audio content, the usual encoded format of the data is referred to as AAC (Advanced Audio Coding ISO 13818-7) which is a compression standard with associated codecs (coder-decoder) commercially available in hardware and software. For video, the usual encoded format is H.264, a similar standard with compression, also with commercially available codecs.

"During the playback process, portions of the decrypted content (packets for audio, frames for video), are temporarily stored in a buffer prior to being supplied to the AAC or H.264 or other decoder. Hackers (illicit copiers) may be able to access the decrypted data in this buffer using a standard software tool known as a debugger attachment. The hacker can then copy the accessed data out of the buffer, store it, and as the content is played thereby have a decrypted copy of the entire content, without having to break the actual encryption."

The inventors are Julien Lerouge, Gianpaolo Fasoli and Augustin J. Farrugia.

Apple Inc.
Alphabet Inc.
Microsoft Corporation
MacNews Search:
Community Search:
view counter

view counter
view counter
view counter
view counter
view counter
view counter

Sago Mini Superhero (Education)
Sago Mini Superhero 1.0 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0 (iTunes) Description: KAPOW! Jack the rabbit bursts into the sky as the Sago Mini Superhero! Fly with Jack as he lifts impossible weights, powers up on carrots and makes things right in the city. Whether he is helping ducks cross the street... | Read more »
Star Wars: Galaxy of Heroes guide - How...
Star Wars: Galaxy of Heroes is all about collecting heroes, powering them up, and using them together to defeat your foes. It's pretty straightforward stuff for the most part, but increasing your characters' stats can be a bit confusing because it isn't explained all that well in the tutorial. [Read more] | Read more »
The best cooking apps (just in time for...
It’s that time of year again, where you’ll be gathering around the dinner table with your family and a huge feast in front of you. [Read more] | Read more »
Square Rave guide - How to grab those te...
Square Rave is an awesome little music-oriented puzzle game that smacks of games like Lumines, but with its own unique sense of gameplay. To help wrap your head around the game, keep the following tips and tricks in mind. [Read more] | Read more »
Snowboard Party 2 (Games)
Snowboard Party 2 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Crowned the best snowboarding game available on the market, Snowboard Party is back to fulfill all your adrenaline needs in this long-awaited sequel. Experience the new time-attack race mode and practice your best tricks in... | Read more »
One Button Travel (Games)
One Button Travel 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: “To cut a long story short, If you like interactive fiction, just go buy this one.” -“Oozes the polish that we’ve come to expect from TheCodingMonkeys.” - | Read more »
Light Apprentice Volume 1 (Games)
Light Apprentice Volume 1 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Light Apprentice Volume 1 includes Chapters 1 to 4, all gathered in a new exclusive game.When life in the world of Ethenia is threatened by the corruption of the Yhrosian Empire, a hero will rise to protect the... | Read more »
The best games like Animal Crossing on m...
Animal Crossing amiibo Festival is out right now for the Wii U, reminding us of just how much fun that world can be. Or at least to go back and check in on our villages once in a while. [Read more] | Read more »
Between 2 Taps - Tap for Tap interview M...
Hello, and welcome back to Between 2 Taps, Tap for Tap’s Indie Dev interview series. [Read more] | Read more »
Facility 47 (Games)
Facility 47 1.0.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.1 (iTunes) Description: You wake up alone and freezing in an icy cell. You try the cell door but it’s locked, it seems that you are stuck with no apparent escape. All that surrounds you is a letter and a bottle of pills, and no sign of how long you... | Read more »
All contents are Copyright 1984-2010 by Xplain Corporation. All rights reserved. Theme designed by Icreon.