David Alan Farber

US Patent:

6415280, Jul 2, 2002

Filed:

Apr 1, 1999

Appl. No.:

09/283160

Inventors:

David A. Farber - Ojai CA
Ronald D. Lachman - Northbrook IL

Assignee:

Kinetech, Inc. - Northbrook IL
Digital Island, Inc. - San Francisco CA

International Classification:

G06F 1730

US Classification:

707 2, 707 3, 707 10, 707101, 709203, 709219, 709229

Abstract:

In a system in which a set of data items are distributed across a network of servers, at least some of the data items being cached versions of data items from a source server, a content delivery method includes determining a data identifier for a particular data item, the data identifier being determined using a given function of the data comprising the particular data item; and responsive to a request for the particular data item, the request including at least the data identifier of the particular data item, providing the particular data item from a given one of the servers of the network of servers. The request for the particular data item may be resolved based on a measure of availability of at least one of the servers, where the measure of availability may be a measurement of bandwidth to the server; a measurement of a cost of a connection to the server, and/or a measurement of a reliability of a connection to the server. The function used to determine the identifier may be a message digest function or a hash function.

US Patent:

6654807, Nov 25, 2003

Filed:

Dec 6, 2001

Appl. No.:

10/004430

Inventors:

David A. Farber - Oak View CA
Richard E. Greer - Red Lodge MT
Andrew D. Swart - Westlake Village CA
James A. Balter - Santa Barbara CA

Assignee:

Cable Wireless Internet Services, Inc. - San Francisco CA

International Classification:

G06F 15173

US Classification:

709225, 709226, 709229

Abstract:

Resource requests made by clients of origin servers in a network are intercepted by reflector mechanisms and selectively reflected to other servers called repeaters. The reflectors select a best repeater from a set of possible repeaters and redirect the client to the selected best repeater. The client then makes the request of the selected best repeater. The resource is possibly rewritten to replace at least some of the resource identifiers contained therein with modified resource identifiers designating the repeater instead of the origin server.

US Patent:

6928442, Aug 9, 2005

Filed:

Nov 15, 2001

Appl. No.:

09/987723

Inventors:

David A. Farber - Ojai CA, US
Ronald D. Lachman - Northbrook IL, US

Assignee:

Kinetech, Inc. - Northbrook IL
Savvis, Inc. - Town & Country MO

International Classification:

G06F017/30

US Classification:

707 10, 707 3, 707101, 707200, 709203, 709219, 709229

Abstract:

Data files are distributed across a plurality of computers. The computers may form a network such as a content delivery network (CDN) or a peer-to-peer network. The network may operate as a TCP/IP network such as the Internet. Data files may represent may represent digital messages, images, videos or audio signals. For content—data items or files in the system—a name is obtained (or determined), where the name is based, at least in part, on a given function of the data in a data item or file. The given function may be a message digest or hash function, and it may be MD4, MD5, and SHA. A cony of a requested file is only provided to licensed (or authorized) parties. The system may check one or more computers for unauthorized or unlicensed content. Content is served based on a measure of availability of servers.

US Patent:

7054935, May 30, 2006

Filed:

Mar 13, 2002

Appl. No.:

10/095811

Inventors:

David A. Farber - Oak View CA, US
Richard E. Greer - Red Lodge MT, US
Andrew D. Swart - Westlake Village CA, US
James A. Balter - Santa Barbara CA, US

Assignee:

Savvis Communications Corporation - Town and Country MO

International Classification:

G06F 15/173

US Classification:

709226, 709219

Abstract:

Resource requests made by clients of origin servers in a network are intercepted by reflector mechanisms and selectively reflected to other servers called repeaters. The reflectors select a best repeater from a set of possible repeaters and redirect the client to the selected best repeater. The client then makes the request of the selected best repeater. The resource is possibly rewritten to replace at least some of the resource identifiers contained therein with modified resource identifiers designating the repeater instead of the origin server.

US Patent:

7802310, Sep 21, 2010

Filed:

Oct 31, 2007

Appl. No.:

11/980687

Inventors:

David A. Farber - Ojai CA, US
Ronald D. Lachman - Northbrook IL, US

Assignee:

Kinetech, Inc. - Studio City CA
Level 3 Communications, LLC - Broomfield CO

International Classification:

H04L 29/06
G06F 21/00

US Classification:

726 28, 711163

Abstract:

Access to and delivery of licensed content is controlled using content names that were determined based on the content. A name for a data item is obtained, the name having been determined based at least in part on the data which comprise the contents of the data item. Access to the data item is authorized based at least in part on the name. Once authorized, access may be granted from more than one computer. The name may have been determined using a hash or message digest function such as MD4, MD5 or SHA. The data item may comprise a file, a portion of a file, a page in memory, a digital message, a digital image, a video signal or an audio signal.

US Patent:

7945539, May 17, 2011

Filed:

Oct 31, 2007

Appl. No.:

11/980679

Inventors:

David A. Farber - Ojai CA, US
Ronald D. Lachman - Northbrook IL, US

Assignee:

Kinetech, Inc. - Studio City CA
Level 3 Communications, LLC - Broomfield CO

International Classification:

G06F 17/00

US Classification:

707689, 707770, 707822

Abstract:

A method of distributing a data item to a plurality of computers in a network of computers. A data item is divided into a plurality of segments. Each segment is stored on at least one computer in said network. A list of computers onto which each of said segments has been stored is maintained. When a data item is requested, its component segments are obtained from at least two computers in the network. Some of the computers may form a peer-to-peer network.

US Patent:

7945544, May 17, 2011

Filed:

Oct 31, 2007

Appl. No.:

11/980688

Inventors:

David A. Farber - Ojai CA, US
Ronald D. Lachman - Northbrook IL, US

Assignee:

Kinetech, Inc. - Studio City CA
Level 3 Communications, LLC - Broomfield CO

International Classification:

G06F 17/00

US Classification:

707698, 707821, 707822

Abstract:

Similarity of data items is determined by analyzing corresponding segments of the data items. A function is applied to each segment of a data item and the output of that function is compared to the output of the same function applied to a corresponding segment of another data item. A function may be applied to the output of the functions. The functions may be hash or message digest functions.

US Patent:

7945693, May 17, 2011

Filed:

Oct 31, 2007

Appl. No.:

11/980684

Inventors:

David A. Farber - Ojai CA, US
Richard E. Greer - Red Lodge MT, US
Andrew D. Swart - Pennington NJ, US
James A. Balter - Santa Barbara CA, US

Assignee:

Level 3 Communications, LLC - Broomfield CO

International Classification:

G06F 15/16
G06F 15/173

US Classification:

709234, 709224

Abstract:

A plurality of content providers provide multiple resources to multiple clients. At least some of the resources are to be served to clients from a shared content delivery network (CDN) formed by a plurality of repeater servers. Each content provider provides at least some resources via one or more content sources associated with that content provider. Transmission data rates from the CDN on behalf of some of the content providers are monitored. Based at least in part on the monitored data rates, requests for resources are directed to a source other than the CDN. Redirection of requests may be based on a pricing policy.