US 8,819,421 B2 · File decryption interface

Abstract

Systems and methodologies are described that facilitate digital rights management in a wireless communication environment. Generally, content (e.g., data files, video images, etc.) can be downloaded and maintained in its encrypted state to ensure protection of digital rights. Consequently, programming applications that utilize such content decrypt the content at the time of use (e.g., playback or access). A file interface can be provided that allows applications to access encrypted content utilizing a standardized file I/O interface. Decryption of content can be transparent to individual applications utilizing encrypted content. Therefore, modifications cryptographic algorithms or procedures and changes in key sizes need not affect the programming applications.

Claims34

Dependent claims

A method that facilitates digital rights management, the method comprising:

receiving an encrypted file including metadata comprising encrypted key material, wherein the encrypted file is encrypted using continuous block encryption;
decrypting the metadata to obtain the key material related to the encrypted file;
receiving a request to open the encrypted file from an application, wherein the request to open the encrypted file comprises the key material and the key material includes a key length;
generating, in response to the request to open the encrypted file, a file handle referencing the encrypted file;
associating the encrypted key material related to the encrypted file with the file handle for use in file I/O operations so that the file I/O operations do not require the key material as a parameter of the file I/O operations;
and
performing the file I/O operations as a function of the file handle and the associated encrypted key material, wherein performing the file I/O operations includes:
receiving a file read request from the application using the file handle;
obtaining data from the encrypted file as a function of the read request;
decrypting the obtained data on a block-by-block basis as a function of the encrypted key material associated with the file handle;
and
providing the decrypted data to the application in response to the read request.

9 more elements

An apparatus that facilitates digital rights management, comprising:

a memory that stores an encrypted file, wherein the encrypted file is encrypted using continuous block encryption;
and
a processor that executes instructions for accessing the encrypted file in response to file I/O requests from an application based at least in part upon key material associated with the encrypted file, wherein the processor:
receives the encrypted file including metadata comprising encrypted key material;
decrypts the metadata to obtain the key material related to the encrypted file;
receives a request to open the encrypted file from the application, wherein the request to open the encrypted file comprises the key material and the key material includes a key length;
generates, in response to the request to open the encrypted file, a file handle referencing the encrypted file;
associates the encrypted key material related to the encrypted file with the file handle for use in file I/O operations so that the file I/O operations do not require the key material as a parameter of the file I/O operations;
and
performs the file I/O operations as a function of the file handle and the associated encrypted key material, wherein in performing the file I/O operations, the processor:
receives a file read request from the application using the file handle;
obtains data from the encrypted file as a function of the read request;
decrypts the obtained data on a block-by-block basis as a function of the encrypted key material associated with the file handle;
and
provides the decrypted data to the application in response to the read request.

12 more elements

An apparatus that facilitates digital rights management, comprising:

a memory that stores an encrypted file, wherein the encrypted file is encrypted using continuous block encryption;
and
a processor that executes instructions for accessing the encrypted file in response to file I/O requests from an application based at least in part upon key material associated with the encrypted file, wherein the processor:
receives the encrypted file including metadata comprising encrypted key material;
decrypts the metadata to obtain the key material related to the encrypted file;
receives a request comprising a key length to open the encrypted file from the application, wherein the request to open the encrypted file comprises the key material and the key material includes a key length;
generates, in response to the request to open the encrypted file, a file handle referencing the encrypted file;
associates the encrypted key material related to the encrypted file with the file handle for use in file I/O operations so that the file I/O operations do not require the key material as a parameter of the file I/O operations;
and
performs the file I/O operations as a function of the file handle and the associated encrypted key material, wherein in performing the file I/O operations, the processor:
decrypts obtained data from the encrypted file on a block-by-block basis as a function of the encrypted key material associated with the file handle;
and
provides the decrypted data to the application in response to the read request.

10 more elements

Dependencies are inferred from the claim text.

File decryption interface

Life of this patent

File decryption interface

Life of this patent

Abstract

Claims34