David B Platt

US Patent:

6487646, Nov 26, 2002

Filed:

Feb 29, 2000

Appl. No.:

09/515408

Inventors:

Donald Adams - Pleasanton CA
David Chandler Platt - Mountain View CA
Stephen Lacey - Mountain View CA

Assignee:

Maxtor Corporation - Longmont CO
TiVo, Inc. - Sunnyvale CA

International Classification:

G06F 1200

US Classification:

711163, 711164, 713200

Abstract:

The present invention is related to a data storage device capable of restricting access to data storage or retrieval when a first code is incompatible with a second code. The data storage device comprises (a) a data storage media having a data storage region; and (b) a controller adapted to compare a first code with a second code and to restrict access to a portion of the data storage region of the data storage device if the first code is incompatible with the second code.

US Patent:

6757837, Jun 29, 2004

Filed:

Aug 17, 2000

Appl. No.:

09/642255

Inventors:

David Platt - Mountain View CA
Stephen Lacy - Mountain View CA

Assignee:

Tivo, Inc. - Alviso CA

International Classification:

G06F 1100

US Classification:

714 4, 714 38, 717171

Abstract:

A client/server system and method for providing a way of repairing software failures as they occur. This system enhances the software architecture of the client device is discussed by detecting a software failure and giving the client the ability to dial up a connection to a repair server designed for supplying repair software. This special diagnostic server takes control of the client device, performs a diagnostic, retrieves log information, and downloads and executes software to repair the failure. The system turns control over from the client device to the repair server to execute commands issued by the repair server. Once the connection to the server is established, all of the intelligence in the diagnostic and repair process is driven by the repair server. This allows the repair server to identify and repair the software failures found in the client device without having to change the software in the client device. The repair process can be performed while on-line with the repair server or deferred until after a reboot.

US Patent:

6965730, Nov 15, 2005

Filed:

May 10, 2001

Appl. No.:

10/275927

Inventors:

David Chamberlin - Mountain View CA, US
David C. Platt - Mountain View CA, US
Eric Vannier - Fremont CA, US
Dan Zenchelsky - Los Gatos CA, US

Assignee:

TiVo, Inc. - Alviso CA

International Classification:

H04N005/85
H04N005/97

US Classification:

386125, 386124, 386 46

Abstract:

A method for dynamically managing a digital recording system's bandwidth requirements, provides prioritized accesses to the recording system's hard drive according to a pre-defined policy which gives the first priority to the data streams being written to the disk, the second priority to the data streams being read from the disk, and the third priority to other accesses to the disk. The recording system's bandwidth efficiency may also be improved by optimizing allocation of the disk's storage space which is partitioned into lower bandwidth portions and higher bandwidth portions, where lower bandwidth data streams are stored in lower bandwidth portions and higher bandwidth data streams are stored in higher bandwidth portions.

US Patent:

7055031, May 30, 2006

Filed:

Feb 14, 2001

Appl. No.:

09/784512

Inventors:

David C. Platt - Mountain View CA, US

Assignee:

TiVo, Inc. - Alviso CA

International Classification:

H04L 9/00

US Classification:

713168, 726 4, 726 6, 726 9, 726 10, 726 28, 726 30, 726 29, 713161, 713171, 713176, 713169, 713170, 380278, 380282, 380 30, 705 14, 705 67, 705 71, 705 72, 705 75, 705 76, 705 78, 235462

Abstract:

A process for coupon generation, delivery, and validation over a personal TV service system is disclosed. A client issues electronic coupons to personal TV service customers via a personal TV service center which generates a coupon authentication number for each receiver. The coupon authentication number is known to the key server and the coupon authentication number database. It is also known to the receiver in encrypted form. The product serial number for each receiver acts as a public key, which is known to both the customer and the personal TV service center. A unique offer ID number is assigned to each coupon. When the receiver receives the coupon, it performs a hash operation on the offer ID number using the authentication ID number and takes first or last N digits of the hashed result as the coupon ID number. The customer may redeem the coupon by submitting the offer ID number, the receiver serial number, and the coupon ID number. Before the coupon is redeemed, it must be validated.

US Patent:

7216235, May 8, 2007

Filed:

Aug 17, 2000

Appl. No.:

09/642617

Inventors:

David Platt - Mountain View CA, US

Assignee:

TiVo Inc. - Alviso CA

International Classification:

H04L 9/00

US Classification:

713182, 713164, 713189

Abstract:

An authentication system for securing information within a disk drive to be read and written to only by a specific host computer such that it is difficult or impossible to access the drive by any system other than a designated host is disclosed. While the invention is similar in intent to a password scheme, it significantly more secure. The invention thus provides a secure environment for important information stored within a disk drive. The information can only be accessed by a host if the host can respond to random challenges asked by the disk drive. The host's responses are generated using a cryptography chip processing a specific algorithm. This technique allows the disk drive and the host to communicate using a coded security system where attempts to break the code and choose the correct password take longer to learn than the useful life of the disk drive itself.

US Patent:

7409546, Aug 5, 2008

Filed:

Jul 2, 2002

Appl. No.:

10/189079

Inventors:

David C. Platt - Mountain View CA, US

Assignee:

TiVo Inc. - Alviso CA

International Classification:

G06F 15/177
H04L 9/00

US Classification:

713165, 713 2, 713189

Abstract:

A cryptographically signed filesystem provides a central database resident on a server that contains database objects. The server creates startup software to be installed in a client system's read only memory. The startup software contains a hash value for a second stage loader. The server also creates software for a bootstrap loader object which typically contains the operating system for a client system and also the bootstrap loader's hash value and a digital signature that is unique to the server. A root filesystem object is also created containing operational code and data for the client system's functionality. A hash table file is stored in the bootstrap loader that contains the names of each file in the root filesystem along with their corresponding hash values. The startup software and objects created by the server are initially installed on a client device at the time of manufacture. The client performs a staged bootup sequence that confirms that the hash value is correct for each of the objects before they are executed.

US Patent:

7590240, Sep 15, 2009

Filed:

Mar 2, 2001

Appl. No.:

10/220356

Inventors:

David C. Platt - Mountain View CA, US
Andrew Goodman - Menlo Park CA, US
Daniel Zenchelsky - Los Gatos CA, US

Assignee:

TiVo Inc. - Alviso CA

International Classification:

H04N 7/167

US Classification:

380210

Abstract:

In a conditional access system, a headend transmits content to one or more receivers in encrypted transport streams. The system provides a multi-layer security architecture, rendering the system resistant to key replay attacks; if one layer is circumvented, subsequent layers remain intact. A first layer prevents unencrypted keys from being recorded by shielding the unencrypted keys from users and encrypting the path from the receiver's conditional access module to the transport decryption module; a second layer prevents a key recorded on one receiver from being played back to the transport decryption module on a second receiver; a third layer prevents a user from decrypting transport streams without the encryption module by encrypting the stream a second time prior to being passed through any user-accessible memory or processor. Events tables are transmitted with the transport stream, either unencrypted for immediate use or encrypted, to prevent unauthorized use.

US Patent:

7908635, Mar 15, 2011

Filed:

Feb 27, 2001

Appl. No.:

10/220558

Inventors:

James M. Barton - Alviso CA, US
David C. Platt - Mountain View CA, US

Assignee:

TiVo Inc. - Alviso CA

International Classification:

H04N 7/173

US Classification:

725134, 725105, 725110, 725114, 725115

Abstract:

A communication system and a family of methods for remote access to personal television service are disclosed. According to this invention, a remote personal TV service center provides centralized program guide information. A user may access to the personal TV service center through a digital video recorder which is connected to the personal TV service center via telephone modem or a network server. A user may access to the personal TV service center through a remote computer terminal or a personal digital assistant which is connected to a computer network. The user selects program events and programs the digital video recorder by using a graphical user interface installed in the front panel of the digital video recorder in case of local programming, or using a similar GUI which is incorporated into the Web pages presented to remote users by a Web server in case of remote programming. The media stream stored in one digital video recorder may be transferred to another digital video recorder. For data security protection during data transfer, all communication are authenticated and encrypted.