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  System, method, and device for playing back recorded audio, video or other content from non-volatile memory cards, compact disks or other mediaUSPTO Application #: 20070237329Title: System, method, and device for playing back recorded audio, video or other content from non-volatile memory cards, compact disks or other media Abstract: A secure software system for a portable device or computer that provides a simple interface to the device or computer and that retrieves and dynamically decrypts keys and content from a secure media while minimizing exposure of the keys and eliminating the need for manufacturers of the device or computer to create a their own system to manage these complex processes. (end of abstract) Agent: Winston & Strawn, LLP - Washington, DC, US Inventors: Bahman Qawami, Farshid Sabet-Sharghi, Robert C. Chang USPTO Applicaton #: 20070237329 - Class: 380201000 (USPTO) Related Patent Categories: Cryptography, Video Cryptography, Copy Protection Or Prevention The Patent Description & Claims data below is from USPTO Patent Application 20070237329. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND [0001] 1. Field of the invention [0002] This invention relates generally and specifically to secure playback of digital audio, video or other content from memory cards, compacts disks or other media. [0003] 2. Related art [0004] The potential of electronic distribution of copyrighted music over the Internet, by other communication systems or through retail kiosks, is being limited by concerns about unauthorized copying of the music. This is also the case for other audio, as well as video, content. The content is typically provided to the ultimate customer in encrypted form, and the customer records the encrypted content files onto some storage media, such as a personal computer memory, a memory of a portable playing device, a writable compact disk (CD) or a non-volatile memory card. Providers of the content would like to eliminate the possibility of unauthorized copying of the content but have to be satisfied with taking steps that minimize the amount of copying that occurs. This includes providing protection of the content on the recording media. The protection of content stored on non-volatile memory cards is described herein, as specific examples, but the same content protection techniques can be applied to compact disks or other recordable media. [0005] There are several commercially available non-volatile memory cards that are suitable for use as the content data storage media. One is the CompactFlash (CF) card, another is the MultiMediaCard (MMC), and yet another is the Secure Digital (SD) memory card that is closely related to the MMC card. All three, and others, are available in various storage capacities from SanDisk Corporation of Sunnyvale, Calif., assignee of the present application. The physical and electrical specifications for the MMC are given in "The MultiMediaCard System Specification" that is updated and published from time-to-time by the MultiMediaCard Association ("MMCA") of Cupertino, Calif. Versions 2.11 and 2.2 of that Specification, dated June 1999 and January 2000, respectively, are expressly incorporated herein by this reference. The MMC products are also described in a "MultiMediaCard Product Manual," Revision 2, dated April 2000, published by SanDisk corporation, which Manual is expressly incorporated herein by this reference. Certain aspects of the electrical operation of the MMC products are also described in co-pending patent applications of Thomas N. Toombs and Micky Holtzman, Ser. Nos. 09/185,649 and 09/186,064, both filed Nov. 4, 1998, and assigned to SanDisk Corporation. The physical card structure and a method of manufacturing it are described in U.S. Pat. No. 6,040,622, assigned to SanDisk Corporation. Both of these applications and patent are also expressly incorporated herein by this reference. [0006] The newer SD Card is similar to the MMC card, having the same in plan view. A primary difference between them is that the SD Card includes additional data contacts in order to enable faster data transfer between the card and a host. The other contacts of the SD Card are the same as those of the MMC card in order that sockets designed to accept the SD Card will also accept the MMC card. The electrical interface with the SD card is further made to be, for the most part, backward compatible with the MMC product described in version 2.11 of its specification referenced above, in order that few changes to the operation of the host need be made in order to accommodate both types of card. The electrical interface of the SD Card, and its operation, are described in co-pending patent application Ser. No. 09/641,023, filed Aug. 17, 2000, which application is incorporated herein in its entirety by this reference. SUMMARY OF THE INVENTION [0007] Encrypted content is difficult to access, and memory cards or compact disks with encrypted content each have specific structures that require specific commands and routines to access encrypted and unencrypted content. The software of the present invention is a simple solution that any original equipment manufacturer (OEM) can install and run on a myriad of different types of devices having a myriad of different types of microprocessors. These devices range from personal computers to portable devices to car stereos, and include any device from which one would like to access content that may be encrypted. The portable devices may be portable audio players or cell phones or portable organizers or generally any microprocessor controlled portable device. The storage media may be flash memory or any type of recordable disk. The devices may have a simple or powerful microprocessor with a small or large amount of memory. The software utilizes and requires only a small buffer for encryption purposes and is descigned to run efficiently even in environments with limited processing power and memory. It can be run by any type of general purpose microprocessor, special purpose microprocessors such as a DSP, or an ASIC. Additionally, computationally demanding portions of the software, such as the encryption and decryption (security) engine may be executed by the DSP while other portions of the software may be executed by a another microprocessor or an ASIC. [0008] The software has audio, video and image interfaces to receive commands for each of the respective types of files. These interfaces can organize playback and recording, including managing playlists and other convenient features. Thus, whatever the device, it need only issue a command to an interface and the software will take care of reading or writing data from the secure media, and decoding and decompressing the data from any well known audio, video or image file formats within the audio video or image engines. [0009] The encryption and decryption takes place in an isolated module that is very difficult to access and thus isolated from any attempts from unauthorized persons wishing to access encryption keys in order to copy the files from the media or the device. Content is only decrypted in small portions, and a method of dynamic key generation and deletion minimizes exposure of decrypted keys. BRIEF DESCRIPTION OF THE FIGURES [0010] FIG. 1 is an illustration of the devices used to read and write information on a secure media. [0011] FIG. 2 is a schematic diagram of a device used to access the secure media. [0012] FIG. 3A is an abstract illustration of the layers of the secure media. [0013] FIG. 3B is an illustration of the physical and logical structure of the memory cells of the secure media. [0014] FIG. 4 is an illustration of a media key block (MKB) image broken into its component chunks. [0015] FIG. 5 is an illustration of a portion of the authentication and decryption process. [0016] FIG. 6 is an illustration of the authentication and encryption process. [0017] FIG. 7 is a schematic of the authentication key exchange process shown in FIG. 6. [0018] FIG. 8 is a block diagram illustrating the modules of the software of the present invention. [0019] FIG. 9 is a flow chart overview of the playback of an audio track according to the present invention. [0020] FIG. 10 is a flow chart of the processing of an MKB image seen in FIG. 4, a step of FIG. 9. DETAILED DESCRIPTION Continue reading... Full patent description for System, method, and device for playing back recorded audio, video or other content from non-volatile memory cards, compact disks or other media Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this System, method, and device for playing back recorded audio, video or other content from non-volatile memory cards, compact disks or other media patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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