Adobe, Inc.

Digital Guardian LLC

Sunil Agrawal

James D Pravetz

Joseph Steele

Andrei Sheretov

Krish Chaudhury

Katherine K Nadell

Viswanathan Swaminathan

Florian Pestoni

William Ie

Sujata Das

Charles R Myers, Iv

Pritham Shetty

Kunal R Shah

Naveen Ramaiah

Praveen Banoth

Wei Zhang

Xuejun Xu

James Lester

Peter Sorotokin

Vijay Sadanand Ghaskadvi

Vivek K Hebbar

Shyam Sunder Vijay

Roderick Schultz

John Landwehr

Jason Boyer

Noam Lorberbaum

Matthew J Poling

Jagriti Uppal

Systems and methods for enhanced DOM and event mirroring and security in web applications provides an intermediate Master Browser between web content and client devices to improve security and other enhancements.

Enhanced document and event mirroring for accessing internet content

Methods, computer-implemented systems, and apparatus provide for a DRM Migrator that extracts embedded first license information that enables licensed access to content according to a first licensing system. The DRM Migrator sends the first license information to a server compatible with a second licensing system. After sending the first license information to the server, the DRM Migrator receives second license information that enables an end user to create a request for a license that provides access to the content according to the second licensing system. Another embodiment of the DRM Migrator also receives the first license information from a source and generates the second license information. After generating the second license information, the DRM Migrator sends the second license information to the source to enable creation of a request for a license that provides access to the content according to the second licensing system.

Migration between digital rights management systems without content repackaging

In some embodiments, a method includes establishing a secured connection between a client device and a subordinate web service of a single sign-on service for a user, using a shared cryptographic key in a cookie stored on the client device that was transmitted over a different secured connection by a master web service of the single sign-on service, as part of authentication of the user for the single sign-on service.

Cryptographic binding of multiple secured connections

Various embodiments of a system and method for multipronged authentication are described. Embodiments may include a client system that implements a runtime component configured to consume content. The client system may be configured to implement a digital rights management component configured to perform one or more cryptographic operations and also authenticate the runtime component. The client system may receive encrypted content from a remote computer system and receive a given authentication component from a remote computer system; that authentication component may be configured to authenticate the runtime component. The client system may, based on authentication of the runtime component by both the digital rights management component and the given authentication component, decrypt at least a portion of the encrypted content. In this way, the client system may ensure that decryption of the encrypted content may occur only if multiple components authenticate the runtime component, according to some embodiments.

System and method for multipronged authentication

Methods and apparatus, including computer program products, implementing and using techniques for document authentication. An electronic document is presented to a user. The electronic document has data representing a signed state and a current state. A disallowed difference between the signed state and the current state is detected, based on one or more rules that are associated with the electronic document. A digital signature associated with the electronic document is invalidated in response to the detecting.

Document modification detection and prevention

A security component may be associated with a network-enabled application. The security component may access a secure store, which may include customization information, which may include one or more graphical user interface customizations defined by a user, and one or more instances of card information. The card information may specify how to authenticate a user's credentials to access a relying party (e.g., web site). The security component may initiate the display of an embedded region of a window drawn by the network-enabled application. At least a part of the appearance of the embedded region of the window may be defined according to the customization information and not by the relying party. The embedded region may provide a user interface for determining user authentication credentials. The customization information and the one or more instances of card information may not be accessible to the relying party.

Secure portable store for security skins and authentication information

Various embodiments of a system and method for a single request and single response authentication protocol are described. A client may send to an authentication server a request to authenticate the identity of a user attempting to access an electronic document protected by a rights management policy. The single request may be generated according to rights management configuration information included within the document. Such rights management information may include one or more parameters for requesting authentication from an authentication server. In response to the request, an authentication server may send a single response to the client. The single response may include information indicating that the identity is authenticated (e.g., a license to access the document, or an encryption key to decrypt the document). The client system may be configured to, in response to the single response, provide access to the document according to the rights management policy.

System and method for a single request and single response authentication protocol

Video media subscribers attempt to circumvent embedded ads in downloads by modifying the media files to render only the content feature. A media program is defined as an integrated set of media files including the requested content feature and the accompanying promotional materials. Media files associated with a particular content feature are stored as an integrated whole, and security tokens computed on selected random portions of the collection of media files that define the media program (content feature and interspersed ads). A hash engine computes a security token on selected blocks of the media files. The security tokens and corresponding metadata are stored in a secure repository. Before rendering the content feature, the hash values are recomputed on the downloaded media program; and compared to the corresponding locations from the stored hash values and metadata.

Tamper resistant video rendering

Various embodiments of a system and method for deterministic generation of a common content encryption key on distinct encryption units are described. Embodiments may include, for each given content item of multiple content items that represent one or more portions of a common media object, controlling a different encryption unit of multiple distinct encryption units to i) generate a content encryption key for the given content item based on: a common base secret shared by the multiple distinct encryption units, and an identifier specific to the media object, and ii) encrypt the given content item with the respective content encryption key generated for that content item in order to generate a respective encrypted content item. Each content encryption key generated for a given content item may be equivalent to each other content encryption key such that decryption of each encrypted content item requires a common decryption key.

System and method for deterministic generation of a common content encryption key on distinct encryption units

Various embodiments of a system and method for digital rights management with secure application-content binding are described. Various embodiments may include a system configured to decrypt an encrypted application key with a private key. The system may also be configured to decrypt an encrypted application including a binding key with the decrypted application key. The system may also be configured to decrypt an encrypted content key with the binding key from the decrypted application. The system may be further configured to decrypt encrypted content with the decrypted content key. In various embodiments, the system may also be configured to consume the decrypted content with the decrypted application.

System and method for digital rights management with secure application-content binding

Various embodiments of a system and method for a single request-single response protocol with mutual replay attack protection are described. Embodiments include a system that receives multiple single request messages, each of which include a respective nonce, timestamp, and digital signature. The system may create a record of previously received nonces that, at any given time, may include multiple message nonces received within a valid period of time prior to that given time. To validate a given single request message, the system verifies the digital signature of the message, determines that the timestamp of the message indicates a time within the valid period of time prior to the current time, and determines that the nonce of the message is not present within the record of previously received nonces. The system sends a single response message that includes the same nonce as the validated message.

System and method for a single request&#x2014;single response protocol with mutual replay attack protection

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for verifying a message based on application of a hashing algorithm. In one aspect, a method includes obtaining a license, from a remote server, for a content item to be presented using a player file executed by a multimedia player on a computing device. The license includes an encryption key and an authorization to present the content item using one or more authorized player files. A particular player file is received for use in presenting the content item, and a determination is made whether the particular player file is authorized for use in presenting the content item based on the authorization. The content item is decrypted using the encryption key, and the content item is presented using the particular player file in accordance with the determination.

Growing community of inventors

Milpitas, CA, United States of America

Sunil Agrawal