Anand D Paka

US Patent:

7620809, Nov 17, 2009

Filed:

Apr 15, 2005

Appl. No.:

11/107513

Inventors:

Richard D. Prologo - Sammamish WA, US
Eduardo P. Oliveira - Redmond WA, US
Clifford P. Strom - Sammamish WA, US
Brian P. Evans - Redmond WA, US
Benjamin Brooks Cutter - Kirkland WA, US
Anand D. Paka - Bellevue WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

H04L 9/00

US Classification:

713156, 713155, 713165, 713168, 713175, 380 43, 726 4

Abstract:

A method of registering network devices in a digital rights management system (DRMS) includes receiving a digital certificate transmitted by the network device requesting registration and verifying the validity of the certificate. The DRMS may then send cryptographic information to the applying network device. The network device may be authorized for registration via a user interface to the DRMS. The DRMS may conduct a proximity test to determine of the network device is proximate to the DRMS. If the certificate is validated, authorization is received, and the proximity test indicates that the network device is proximate to the DRMS, the network device may be registered. A registered network device is then authorized to play protected digital content.

US Patent:

7693280, Apr 6, 2010

Filed:

Apr 22, 2005

Appl. No.:

11/112325

Inventors:

Brian P. Evans - Redmond WA, US
Clifford P. Strom - Sammamish WA, US
Daniel Rosenstein - Newcastle WA, US
Anand D. Paka - Bellevue WA, US
Nicholas J. Fang - Redmond WA, US
Eduardo Oliveria - Redmond WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

H04L 9/00

US Classification:

380 44

Abstract:

A sequence of content keys are shared between a receiver of pieces of digital content and a computing device upon which the content is to be rendered. The receiver encrypts each piece of content according to a corresponding content key in the sequence and forwards the encrypted content to the computing device and the computing device decrypts the encrypted content according to the corresponding content key. The receiver initially transmits to the computing device an initialization digital license with an initial content key (CK) therein. Each of the receiver and the computing device derive a new content key (CKx) in the sequence from the initial content key (CK()) in the sequence on an as-needed basis and in a coordinated fashion. The initialization license is required only once for the sequence of content keys, and the receiver need not explicitly communicate (CKx) to the computing device for each piece of content.

US Patent:

7769880, Aug 3, 2010

Filed:

Jul 7, 2005

Appl. No.:

11/176058

Inventors:

Anand Paka - Bellevue WA, US
Anders E. Klemets - Redmond WA, US
Eduardo P. Oliveira - Redmond WA, US
Sanjay Bhatt - Redmond WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

G06F 15/16
H04N 7/173
H04N 7/16
G06F 15/173

US Classification:

709231, 725 87, 725 25, 709224

Abstract:

Various embodiments utilize methods of protecting content, such as Digital Rights Management (DRM), to enable secure playback of content on machines and devices within a local network, such as a home media network. In at least some embodiments, messages and content are delivered using, respectively, a control protocol for streaming and a transport protocol. In at least some embodiments, the control protocol for streaming is Real Time Streaming Protocol (RTSP), and the transport protocol is Real Time Transport Protocol (RTP).

US Patent:

8321690, Nov 27, 2012

Filed:

Aug 11, 2005

Appl. No.:

11/201751

Inventors:

Eduardo P. Oliveira - Redmond WA, US
Anders E. Klemets - Redmond WA, US
Sanjay Bhatt - Redmond WA, US
Anand Paka - Bellevue WA, US
James M. Alkove - Woodinville WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

G06F 12/14

US Classification:

713193, 713150, 380 37, 380277

Abstract:

Systems and/or methods (“tools”) are described that enable a digital rights management policy to be associated with digital media having an arbitrary content type or transfer control protocol. In some embodiments, the tools encrypt data segments of a media file and add a descriptor to each of those segments. These descriptors can enable a receiver of the encrypted media file to decrypt the file and consume it according to the correct digital rights management policy.

US Patent:

8370625, Feb 5, 2013

Filed:

Jun 11, 2008

Appl. No.:

12/137513

Inventors:

Yu Lin Sie - Bellevue WA, US
Kedarnath A Dubhashi - Redmond WA, US
Anand D Paka - Redmond WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

H04L 29/06

US Classification:

713156

Abstract:

Various embodiments enable so-called extended data to be added to a signed digital certificate without having a private key of a Certification Authority available. In at least some embodiments, a digital certificate can be issued and signed off line by the Certification Authority, and then later extended data can be added and signed using another key, whose public key was earlier embedded and signed in the certificate.

US Patent:

8539543, Sep 17, 2013

Filed:

Apr 12, 2007

Appl. No.:

11/734715

Inventors:

Patrik Schnell - Issaquah WA, US
Clifford P. Strom - Sammamish WA, US
Kedarnath A. Dubhashi - Redmond WA, US
Daniel Rosenstein - Issaquah WA, US
Mark L Beaubien - Kent VT, US
Alex McKelvey - Seattle WA, US
Alexandre V. Grigorovitch - Redmond WA, US
Anand Paka - Redmond WA, US
Satvir Randhawa - Redmond WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

G06F 17/00

US Classification:

726 1, 726 26, 726 27, 726 31

Abstract:

Techniques enable building a collection of data that defines an asset, with the data possibly having differing data types. These techniques are then capable of assigning arbitrary policy to that asset, regardless of which data types are present within the asset. In addition, these techniques enable packaging of this first asset with one or more additional assets in a self-contained envelope. Each asset within the envelope may similarly include data of differing data types. Furthermore, each of these assets may be assigned a policy that may be different than the policy assigned to the first asset. This envelope, or a collection of envelopes, may then be provided to a content-consuming device to consume the assets in accordance with each asset's specified policy.

US Patent:

20050262022, Nov 24, 2005

Filed:

May 27, 2005

Appl. No.:

11/139951

Inventors:

Eduardo Oliveira - Redmond WA, US
James Alkove - Woodinville WA, US
Richard Prologo - Redmond WA, US
Troy Batterberry - Kirkland WA, US
Anand Paka - Bellevue WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

G06F017/60

US Classification:

705051000

Abstract:

A sink sends a registration request to a source and the source validates same, and the source sends a registration response including a secret to the sink. The source then sends a proximity message including a nonce to the sink and concurrently notes a start time. The sink employs the secret and the nonce to generate a proximity value and sends same to the sources. The source receives the proximity value and concurrently notes an end time, verifies the proximity value based on the secret and the nonce, calculates from the noted start and end times an elapsed time, compares the elapsed time to a predetermined threshold value, decides from the comparison whether the sink satisfies the proximity requirement, and registers the sink as being able to access content from such source if the sink satisfies the proximity requirement.

US Patent:

20060242079, Oct 26, 2006

Filed:

Apr 22, 2005

Appl. No.:

11/113215

Inventors:

Brian Evans - Redmond WA, US
Clifford Strom - Sammamish WA, US
Daniel Rosenstein - Newcastle WA, US
Anand Paka - Bellevue WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

G06F 17/60

US Classification:

705059000

Abstract:

A receiver tunes content and initially does not locate information relating to requirements for a corresponding license, and therefore constructs a default message including default requirements and sends such constructed default message with such default requirements to a computing device that is to render the content. The computing device upon receiving the sent default message with the default requirements constructs a default version of a license based on such received default requirements, stores such constructed default version of the license in a license store of such computing device, and thereafter renders the content only in accordance with the default version of the license.