George L Homsy

US Patent:

20020038296, Mar 28, 2002

Filed:

Feb 16, 2001

Appl. No.:

09/785535

Inventors:

Norman Margolus - Somerville MA, US
Thomas Knight - Belmont MA, US
Bruce Boghosian - Lexington MA, US
Jered Floyd - Cambridge MA, US
Sam Hartman - Cambridge MA, US
George Homsy - Cambridge MA, US
Gill Pratt - Lexington MA, US

International Classification:

G06F007/00

US Classification:

707/001000, 707/104100

Abstract:

In general, the invention features methods by which more than one client program connected to a network stores the same data item on a storage device of a data repository connected to the network. In one aspect, the method comprises encrypting the data item using a key derived from the content of the data item, determining a digital fingerprint of the data item, and storing the data item on the storage device at a location or locations associated with the digital fingerprint. In a second aspect, the method comprises determining a digital fingerprint of the data item, testing for whether the data item is already stored in the repository by comparing the digital fingerprint of the data item to the digital fingerprints of data items already in storage in the repository, and challenging a client that is attempting to deposit a data item already stored in the repository, to ascertain that the client has the full data item.

US Patent:

20040167898, Aug 26, 2004

Filed:

Feb 26, 2003

Appl. No.:

10/374517

Inventors:

Norman Margolus - Somerville MA, US
Jered Floyd - Cambridge MA, US
George Homsy - Cambridge MA, US
Jeffrey Keller - Cambridge MA, US

International Classification:

G06F017/30

US Classification:

707/010000

Abstract:

A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.

US Patent:

20040167903, Aug 26, 2004

Filed:

Jan 7, 2004

Appl. No.:

10/752844

Inventors:

Norman Margolus - Somerville MA, US
Jered Floyd - Cambridge MA, US
George Homsy - Cambridge MA, US
Jeffrey Keller - Cambridge MA, US

Assignee:

Permabit, Inc., a Massachusetts corporation

International Classification:

G06F013/28
G06F013/00
G06F012/16
G06F012/14
G06F012/00
G06F017/30
G06F007/00

US Classification:

707/010000, 707/203000, 707/204000, 711/161000, 711/162000

Abstract:

A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.

US Patent:

20040167934, Aug 26, 2004

Filed:

Jan 7, 2004

Appl. No.:

10/752981

Inventors:

Norman Margolus - Somerville MA, US
Jered Floyd - Cambridge MA, US
George Homsy - Cambridge MA, US
Jeffrey Keller - Cambridge MA, US

Assignee:

Permabit, Inc., a Massachusetts corporation

International Classification:

G06F012/00

US Classification:

707/201000

Abstract:

A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.

US Patent:

20040167938, Aug 26, 2004

Filed:

Jan 7, 2004

Appl. No.:

10/752834

Inventors:

Norman Margolus - Somerville MA, US
Jered Floyd - Cambridge MA, US
George Homsy - Cambridge MA, US
Jeffrey Keller - Cambridge MA, US

Assignee:

Permabit, Inc., a Massachusetts corporation

International Classification:

G06F017/30

US Classification:

707/203000

Abstract:

A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.

US Patent:

20040167939, Aug 26, 2004

Filed:

Jan 7, 2004

Appl. No.:

10/752980

Inventors:

Norman Margolus - Somerville MA, US
Jered Floyd - Cambridge MA, US
George Homsy - Cambridge MA, US
Jeffrey Keller - Cambridge MA, US

Assignee:

Permabit, Inc., a Massachusetts corporation

International Classification:

G06F012/00

US Classification:

707/203000

Abstract:

A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.

US Patent:

20040167940, Aug 26, 2004

Filed:

Jan 7, 2004

Appl. No.:

10/753125

Inventors:

Norman Margolus - Somerville MA, US
Jered Floyd - Cambridge MA, US
George Homsy - Cambridge MA, US
Jeffrey Keller - Cambridge MA, US

Assignee:

Permabit, Inc., a Massachusetts corporation

International Classification:

G06F017/30

US Classification:

707/203000

Abstract:

A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.

US Patent:

20040168057, Aug 26, 2004

Filed:

Jan 7, 2004

Appl. No.:

10/752872

Inventors:

Norman Margolus - Somerville MA, US
Jered Floyd - Cambridge MA, US
George Homsy - Cambridge MA, US
Jeffrey Keller - Cambridge MA, US

Assignee:

Permabit, Inc. a Massachusetts corporation

International Classification:

H04L009/00

US Classification:

713/158000

Abstract:

A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.