John H Landwehr

US Patent:

8363882, Jan 29, 2013

Filed:

Jul 25, 2006

Appl. No.:

11/493715

Inventors:

John Landwehr - San Mateo CA, US
Chris Hock - San Francisco CA, US

Assignee:

Adobe Systems Incorporated - San Jose CA

International Classification:

G06K 9/00

US Classification:

382100

Abstract:

Briefly, in accordance with one embodiment, a server may parse content into one or more segments, and process the segments to identify where in the content one or more watermarks may be added. The segments may then be concatenated into processed content that includes watermarking instructions. The processed content may be transmitted to a client for rendering. In some embodiments, the watermarking may be applied dynamically at a server prior to or concurrently with transmission to the client. If the client encounters an instruction to add a watermark, the client may render a watermark based at least in part on client information and/or information capable of identifying the client's user. The watermark may be placed at locations in the content so that the content is discernible by a user, while also being placed within a context of the content so as not to distract from the content experience.

US Patent:

20140029031, Jan 30, 2014

Filed:

Oct 11, 2006

Appl. No.:

11/546712

Inventors:

John Landwehr - San Mateo CA, US

International Classification:

G06F 3/12

US Classification:

358 113, 358 114

Abstract:

Embodiments of converting or translating electronic data from a first format to a second format with an applied electronic data security policy in mechanisms are described generally herein. Other embodiments may be described and claimed.

US Patent:

20140040611, Feb 6, 2014

Filed:

Jul 31, 2012

Appl. No.:

13/562532

Inventors:

Isak Tenenboym - San Jose CA, US
Philip G. Levy - Los Altos CA, US
Marc T. Kaufman - Woodside CA, US
John T. Landwehr - Vienna VA, US

International Classification:

H04L 9/32

US Classification:

713157, 713155, 713156, 713158

Abstract:

Systems and methods are presented for distributed validation of a digitally signed electronic document. A computing device accesses both a representation of the electronic document and a digital signature for the electronic document that includes a digest generated by the digital signature's creator by applying a one-way function to the electronic document. The computing device applies the same one-way function to the accessed representation of the electronic document to generate a new digest, and includes both the digital signature and the new digest in a request sent to a separate validation server. The request does not include the electronic document. The validation server generates validation results that depend on comparing the digest from the digital signature with the new digest, and that do not depend on having the electronic document available to the validation server. The computing device receives the validation results from the separate validation server.

US Patent:

8145909, Mar 27, 2012

Filed:

May 16, 2007

Appl. No.:

11/804069

Inventors:

Sunil Agrawal - Milpitas CA, US
Andrei Sheretov - Campbell CA, US
John Landwehr - San Mateo CA, US

Assignee:

Adobe Systems Incorporated - San Jose CA

International Classification:

H04L 9/00
H04L 9/32
G06F 7/04

US Classification:

713176, 713177, 713178, 713179, 713180, 713181, 726 27, 726 28, 726 29, 726 30

Abstract:

In one example embodiment, a method is illustrated that includes parsing seed data from digital content, the seed data identifying a signing entity, transmitting identifier data to the signing entity identified by the seed data, transmitting content information relating to the digital content to the signing entity, and receiving digitally signed content information relating to the digital content, the digitally signed content information signed by the signing entity. In another example embodiment, a method is illustrated as including parsing seed data from digital content, the seed data identifying a signing entity, transmitting identifier data to the signing entity identified by the seed data, receiving a credential from the signing entity, the credential used to sign the digital content, and signing the digital content using the credential.

US Patent:

20160127131, May 5, 2016

Filed:

Jan 11, 2016

Appl. No.:

14/992986

Inventors:

- San Jose CA, US
Philip G. Levy - Los Altos CA, US
Marc T. Kaufman - Woodside CA, US
John T. Landwehr - Vienna VA, US

International Classification:

H04L 9/32
H04L 29/06

Abstract:

Systems and methods are presented for distributed validation of a digitally signed electronic document. A computing device accesses both a representation of the electronic document and a digital signature for the electronic document that includes a digest generated by the digital signature's creator by applying a one-way function to the electronic document. The computing device applies the same one-way function to the accessed representation of the electronic document to generate a new digest, and includes both the digital signature and the new digest in a request sent to a separate validation server. The request does not include the electronic document. The validation server generates validation results that depend on comparing the digest from the digital signature with the new digest, and that do not depend on having the electronic document available to the validation server. The computing device receives the validation results from the separate validation server.