# US 8,752,204 B2 · Identifying and redacting privileged information > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,752,204 B2 - Document ID: US8752204B2 - Status: Granted - Kind: B2 - Application number: 13/564,032 - Filed: 2012-08-01 - Published: 2013-02-07 - Granted: 2014-06-10 - Earliest claimed: 2011-05-08 - Assignees: Google Inc. - Applicants: Pamela H. Davis; Theresa Hughes Beaumont; Shailesh Kumar - Inventors: Pamela H. Davis; Theresa Hughes Beaumont; Shailesh Kumar - Web page: https://patentgrep.com/patent/US8752204B2 ## CPC - G06Q 10/10: Office automation; Time management - G06Q 10/107: Computer-aided management of electronic mailing [e-mailing] - G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR ## Abstract Systems and methods for identifying and redacting privileged information automatically in electronic discovery documents such as emails are disclosed. In reviewing documents for discovery review, some documents have both privileged and non-privileged information. Significant cost savings are achieved in conducting electronic discovery by automatically identifying and redacting privileged content while preserving non-privileged information for production. ## Claims ### Claim 1 A method for redacting privileged information from an email thread, comprising: identifying a set of email threads containing one or more potentially privileged emails; locating a particular email thread in the set of email threads containing correspondence with a non-privileged party; when the correspondence with the non-privileged party is a last-in-time email, marking the email thread as non-privileged; and when the correspondence with the non-privileged party is not the last-in-time email, automatically redacting emails from the email thread that are later in time than the correspondence with the non-privileged party. ### Claim 2 (depends on 1) The method of claim 1, wherein said automatically redacting emails is based on email message timestamps. ### Claim 3 (depends on 1) The method of claim 1, wherein said identifying a set of email threads containing one or more potentially privileged emails comprises searching the set of email threads for the presence of privilege terms or attorneys. ### Claim 4 A method for redacting privileged information from an email thread, comprising: identifying a set of email threads containing one or more potentially privileged emails; locating a particular email thread in the set of email threads containing correspondence with a privileged party; and when the correspondence with the privileged party is not the last-in-time email, automatically redacting emails from the email thread that are later in time than the correspondence with the privileged party, including the correspondence with the privileged party. ### Claim 5 (depends on 4) The method of claim 4, wherein said automatically redacting emails comprises at least one of redacting emails in native format or redacting emails in searchable image format. ### Claim 6 (depends on 5) The method of claim 5, wherein said locating a particular email thread in the set of email threads containing correspondence with a privileged party comprises searching to, from, and cc, fields of the emails. ### Claim 7 A computer implemented method for redacting, at a server, privileged information from an email thread, the method comprising: receiving, at the server, an email thread containing potentially privileged information; searching the email thread for an adverse party in a last-in-time communication; searching the email thread for an adverse party not in the last-in-time communication; searching the email thread for an attorney in the last-in-time communication; searching the email thread for an attorney not in the last-in-time communication; determining a portion of the email thread that is privileged; and automatically redacting the portion of the email thread that is privileged. ### Claim 8 (depends on 7) The method of claim 7, further comprising preparing the email thread for production in litigation discovery. ### Claim 9 A computer-based system for redacting privileged information from an email thread, comprising: one or more processors; one or more repositories configured to store at least one of responsive documents, privileged parties, adverse parties, or privilege terms; a privilege determination module implemented on at least one of the processors that when executed by the at least one, processor receives a selected one of the responsive documents and to determine whether the selected one of the responsive documents is privileged based on the presence of at least one of the privileged parties, adverse parties, or privileged terms; and an output module configured to redact portions of the selected responsive document based on the privilege determination of the privilege determination module. ### Claim 10 (depends on 9) The system of claim 9, further comprising a domain name extraction module for extracting domain names from the email thread. ### Claim 11 (depends on 9) The system of claim 9, further comprising an email extraction module for extracting emails from the email thread. ### Claim 12 (depends on 11) The system of claim 11, wherein at least one of the one or more repositories is automatically populated by the email extraction module for extracting emails from the email thread. ### Claim 13 A tangible computer program product comprising a non-transitory computer readable storage medium having computer program logic recorded thereon that, when executed by a processor, causes the processor to: identify a set of email threads containing one or more potentially privileged emails; locate a particular email thread in the set of email threads containing correspondence with a non-privileged party; when the correspondence with the non-privileged party is a last-in-time email, mark the email thread as non-privileged; and when the correspondence with the non-privileged party is not the last-m-time email, automatically redact emails from the email thread that are later in time than the correspondence with the non-privileged party. ### Claim 14 (depends on 13) The tangible computer program product of claim 13, wherein said computer readable storage medium having computer program logic recorded thereon that, when executed by a processor, causes the processor to automatically redact emails based on email message timestamps. ### Claim 15 (depends on 13) The tangible computer program product of claim 13, wherein said computer readable storage medium having computer program logic recorded thereon that, when executed by a processor, causes the processor to identify a set of email threads containing one or more potentially privileged emails by searching the set of email threads for the presence of privilege terms or attorneys. ### Claim 16 (depends on 13) The tangible computer program product of claim 13, wherein said computer readable storage medium having computer program logic recorded thereon that, when executed by a processor, causes the processor to automatically redact emails by at least one of redacting emails in native format or redacting emails in searchable image format. ### Claim 17 (depends on 13) The tangible computer program product of claim 13, wherein said computer readable storage medium having computer program logic recorded thereon that, when executed by a processor, causes the processor to locate a particular email thread in the set of email threads containing correspondence with a privileged party by searching to, from, and cc fields of the emails.