Official Use Only Information
Welcome to the Office of Classification Official Use Only (OUO) webpage. This page is designed to provide information, answer questions, and provide a point of contact for inquiries concerning OUO and Controlled Unclassified Information (CUI).
OUO is a Department of Energy (DOE) category of sensitive unclassified information whose release to the wrong person could damage Governmental, commercial, or private interests. This category of information is intended to identify and protect sensitive unclassified information that is not otherwise classified or controlled. A document containing OUO information must be marked so that anyone having the document knows that it contains such information.
Examples of OUO information include:
- Commercial/proprietary information, such as financial information related to bids, contracts, or proposals;
- Privileged information, such as letters, memorandums, issue papers, or other documents that contain advice, opinions, or recommendations the release of which would have an adverse effect on the Government's ability to obtain advice, opinions, or recommendations in the future;
- Personal information, such as social security numbers or performance evaluation reports; and
- Law enforcement information, such as inspection or appraisal procedures, vulnerability assessments, or any information that could help someone who is attempting to violate a law and avoid detection.
All DOE Federal and contractor employees who deal with sensitive information should be familiar with the OUO directives, including the marking and protection requirements. The following resources will assist you in understanding OUO, making accurate OUO determinations, and ensuring that OUO information is properly protected.
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Basis for OUO
Review Requirement
Who can decide whether a document contains OUO information?
In certain cases, the Office of Classification or your program office has already made the OUO decision for you. These decisions are found in classification guides, Unclassified Controlled Nuclear Information (UCNI) guidelines, or in program-issued OUO guidance. If a topic in such guidance indicates that information in your document is OUO, then the document contains OUO information.
Some OUO documents might also contain classified information or UCNI. If a document is in a classified subject area, a Derivative Classifier may need to review the document first to ensure that the document is not classified. Similarly, an UCNI Reviewing Official may also need to review the document.
If a document is not in a classified or UCNI subject area or no guidance exists, you may have to make a determination that is not based on guidance as to whether a document contains OUO. DOE M 471.3-1, Admin Chg 1, Chapter I, Paragraph 2 contains information as to who may make that determination.
No specific designation or training is required in order to make a determination, although training is strongly recommended. A briefing on making OUO determinations is available under the Resources section of this webpage. If you would like additional information, contact the DOE Office of Classification's Outreach Program at (301) 903-7567 or outreach@hq.doe.gov
How do I decide whether a document contains OUO information?
- If the information in a document falls under the scope of an OUO topic in classification guide, UCNI guideline, or in program-issued OUO guidance, the document is OUO.
- For information not falling under the scope of such guidance, you must consider whether the information:
- could damage Governmental, commercial, or private interests if disseminated to persons who do not need the information to perform their jobs or other DOE-authorized activities and
- reasonably falls under a Freedom of Information Act (FOIA) exemption.
- Information cannot be controlled as OUO unless (a) OUO guidance applies or (b) both of the criteria in paragraph 2 are met.
For more information about OUO and the FOIA exemptions, see the section on making OUO determinations

Access to OUO
DOE M 471.3-1, Admin Chg 1, Chapter II, Paragraph 1, details who may have access to OUO.
This means you can give an OUO document to anyone you think needs it to perform his or her job or other Government-authorized activity (unless there are special markings on the document restricting who can see it). The person does not have to have a security clearance or even be a Government employee or U.S. citizen. For example, OUO may be given to an emergency responder, a local police officer, or a member of Congress.
However, it should be noted that some OUO documents are marked to limit who can see them. For example, Export Controlled Information is a special kind of OUO information that cannot be given to foreign nationals and, similarly, contract selection information can only be given to those persons involved in the selection process. If you are not sure whether you can share a document with someone, contact the document's originator.

Protection of OUO
What are the rules for protecting an OUO document or material when a person is using it?
DOE M 471.3-1, Admin Chg 1, Chapter II, Paragraphs 2(a) and (b) contain the specific requirement for protecting OUO in use and storage.
Basically, when using an OUO document, take reasonable precautions to keep the wrong people from reading it. For example, don't read an OUO document in a public place, such as a cafeteria or on an airplane. When storing an OUO document in a locked or guarded office or building, an OUO document may be stored in an unlocked file cabinet, desk, bookcase, etc. Otherwise, the document must be stored in a locked file cabinet, desk, bookcase, etc. Regardless, when using or storing an OUO document, the goal is the same - to keep the information from anyone who doesn't need it to do his or her job.
Are there any restrictions on reproducing a document that contains OUO?
DOE M 471.3-1, Admin Chg 1, Chapter II, Paragraph 2(c) contains the requirements for reproduction of OUO.
Where can I find the approved methods for destroying a document or material containing OUO?
The requirements for the destruction of OUO are found in DOE M 471.3-1, Admin Chg 1, Chapter II, Paragraph 2(d).
How may hard copies of a document marked as containing OUO be transmitted by mail?
DOE M 471.3-1, Admin Chg 1, Chapter II, paragraphs 2e(1) and (2) contain the details for transmitting OUO by mail outside or inside a facility.
Can OUO be hand carried?
Yes. DOE M 471.3-1, Admin Chg 1, Chapter II, paragraph 2e(3) contains the details for hand carrying OUO between or within facilities. The main thing to remember is that you must have continual control over the OUO material.
How is OUO transmitted electronically (by faxed, phone, or email?
For information as to how OUO is transmitted by fax, phone, or email, contact your Program Office.

Questions about Making OUO Determinations - OUO and the FOIA Exemptions
Why is OUO linked to the Freedom of Information Act (FOIA) exemptions?
Under the FOIA, any person can request any information from the Government and get it - except for information falling under any one of the nine exemptions specified in the FOIA. Therefore, trying to control information that doesn't fall under the FOIA exemptions wastes Government resources since such information must ultimately be released. As a result, one of the criteria you must use when deciding if information is OUO is whether it falls under a FOIA exemption.
Note that information under the purview of a topic in classification or UCNI guidance or in program-issued guidance, has already been determined to fall under a FOIA exemption, and further analysis is not necessary. If information is identified as OUO in a guide, it must be marked and protected as OUO.
Are documents marked OUO automatically exempt under the FIOA?
No! The FOIA mandates the release of information to the public except in specifically defined circumstances. OUO markings are only used to control information internally within DOE and to advise other agencies that the information contained in a document is sensitive. Whenever a document is requested under the FOIA, regardless of markings, it must be analyzed by an authorized FOIA official to determine if any information within the document is exempt. FOIA officials will conduct an analysis and determine if information meets the criteria to be exempt from the FOIA. In most cases, the FOIA official will remove the exempt information and release portions of the document that are not exempt.
What are the FOIA exemptions?
There are nine FOIA exemptions. OUO concerns only unclassified information, therefore Exemption 1, which pertains to information classified by Executive order, never applies to OUO. OUO information must fall under at least one of the remaining eight FOIA exemptions. Following is an overview of these exemptions with examples:
Exemption 2, Circumvention of Statute
A Supreme Court decision in March 2011, redefines the use of Exemption 2. Exemption 2 no longer applies to Circumvention of Statute information. Because this has been the sole basis for Exemption 2, the Exemption no longer applies to OUO.
In response to the decision, and based on review of the FOIA exemptions, the Office of Classification issued Policy Bulletin 4, Exemption 2 Guidance (POL-4). POL-4 permits persons making OUO determinations based on guidance to use "Exemption 7, Law Enforcement" in place of Exemption 2 because in most cases, this is an appropriate exemption for DOE security-related information. As guides are reviewed, guide topics that cite Exemption 2 will be analyzed and revised to reflect the appropriate exemption. It is important to note that POL-4 applies only to OUO determinations based on guidance and not to FOIA reviews or to OUO determinations outside of guidance. In such cases blanket use of Exemption 7 in place of 2 is not appropriate. For any FOIA denial that would have previously cited b(2), each FOIA exemption must be examined to determine the appropriate exemption. The same must be done for OUO determinations outside of guidance.
Exemption 3, Statutory Exemption
Within DOE, the Atomic Energy Act is an Exemption 3 statute that is the legal basis for the classification of Restricted Data, and Formerly Restricted Data, and the control of Unclassified Controlled Nuclear Information. These types of information are classified or controlled under other regulations or directives and, therefore, there is no need to designate such information as OUO.
Unless you or someone in your office has experience with information that may be OUO using Exemption 3, it may be difficult to determine if Exemption 3 could apply. If you think information in a document might be OUO using an Exemption 3 statute that is not included in the examples below, you may contact the Office of Classification Outreach Program at (301) 903-7567 or outreach@hq.doe.gov for assistance.
Examples of Exemption 3 OUO information/documents:
Exemption 4, Commercial/Proprietary
Exemption 4 OUO information encompasses:
- Trade Secrets - A trade secret is "a secret, commercially valuable plan, formula, process, or device that is used for the making, preparing, compounding, or processing of trade commodities and that can be said to be the end product of either innovation or substantial effort." Trade secrets are often technical in nature.
- Commercial or Financial Information - Information that is (a) commercial or financial, (b) obtained from a person (includes corporations), and (c) privileged or confidential. Commercial or financial information is usually not technical in nature.
The following should be considered in deciding whether a document may be OUO under Exemption 4:
- If submission of the information is required by the Government, would release of the information impair the Government's ability to obtain information? If it would impair the Government's ability, it could be OUO.
- If submission of the information is required by the Government, would release of the information cause harm to the competitive position of the person submitting the information or adversely impact program effectiveness? If release could cause harm or impact program effectiveness, the information could be OUO.
- If the submission is voluntary, would the person usually release the information to the public? If the person has or would usually release the information to the public, it is not OUO.
Examples of Exemption 4 OUO information/documents:
Exemption 5, Privileged Information
Although there are many categories of privileged information, the privilege most likely to be used within DOE is the deliberative process privilege (also known as "executive privilege"). This privilege ensures that Agency staff is free to make candid comments in the formulation of Agency policies. If every rejected comment were required to be made public, it would have a "chilling effect" on the willingness of the Agency staff to provide their best input, hurting the quality of Agency policies. The following factors should be considered when deciding whether information can be OUO under Exemption 5:
- The document must be for inter-agency or intra-agency communication only. This means that any document not generated for public release may be considered an inter-agency or intra-agency document.
- Release of the document could cause harm to the process of developing Agency policy because such release could:
- discourage open, frank discussions concerning draft policies;
- cause premature disclosure of proposed policies before they are finally adopted; and
- cause confusion in the public that could result from disclosing reasons and rationales that were not ultimately the grounds for an Agency's action.
- A draft document should only be OUO under Exemption 5 if its release could harm the deliberative process.
Examples of Exemption 5 OUO information/documents:
Exemption 6, Personal Privacy
Exemption 6 OUO information protects personal information related to a specific individual that, if disclosed, might cause personal distress or embarrassment or could lead to identity theft. Exemption 6 includes Personally Identifiable Information (PII).
Examples of Exemption 6 OUO information/documents:
Exemption 7, Law Enforcement
Exemption 7 protects from disclosure records or information compiled for law enforcement purposes (including criminal and civil enforcement). The information does not have to have been created for law enforcement but could be used later for law enforcement purposes. It may also be related to the prevention of illegal activities. It includes information that:
- could reasonably be expected to interfere with enforcement proceedings,
- would deprive a person of a right to a fair trial or an impartial adjudication,
- could reasonably be expected to constitute an unwarranted invasion of personal privacy,
- could reasonably be expected to disclose the identity of a confidential source, including a State, local, or foreign agency or authority or any private institution that furnished information on a confidential basis, and, in the case of a record or information compiled by a criminal law enforcement authority in the course of a criminal investigation, or by an agency conducting a lawful national security intelligence investigation, information furnished by a confidential source,
- would disclose techniques and procedures for law enforcement investigations or prosecutions, or would disclose guidelines for law enforcement investigations or prosecutions if such disclosure could reasonably be expected to risk circumvention of the law, or
- could reasonably be expected to endanger the life or physical safety of any individual.
Examples of Exemption 7 OUO information/documents:
Exemption 8, Financial Institutions
Exemption 8 concerns information that is prepared by, on behalf of, or for the use of an agency responsible for the regulation or supervision of financial institutions. Because DOE is not an Agency that regulates or supervises financial institutions (e.g., the Federal Deposit Insurance Agency), it is very unlikely this exemption would be used by DOE employees.
Exemption 9, Wells
Exemption 9 concerns geological and geophysical information and data concerning wells. Exemption 9 OUO information can concern any kind of well (e.g., oil, natural gas, water, geothermal), but is generally limited to technical or scientific information about the well.
Examples of Exemption 9 OUO information/documents:

How is a Document Containing OUO Marked?
Front page marking:
If a document contains OUO, the front page must have the front marking. (DOE M 471.3-1, Admin Chg 1, Chapter I, Paragraph 3a.)
For instructions on filling out the front marking and an electronic sample you may copy to a document, see OUO Stamp with Directions.
Page marking:
The marking "OFFICIAL USE ONLY" must be placed on the bottom of the front of the document and on the bottom of each interior page of the document that contains text or if more convenient, on the bottom of only those interior pages that contain OUO. If space limitations do not allow for use of the full page marking, the acronym "OUO" may be used as the page marking. (DOE M 471.3-1, Admin Chg 1, Chapter I, Paragraph 3b.)
Transmittals:
A document that transmits documents or material marked as containing OUO and does not itself contain classified information or OUO must be marked on its front with "Document(s) transmitted contain(s) OUO information". (DOE M 471.3-1, Admin Chg 1, Chapter I, 3f.)
Marking e-mail:
If the e-mail contains OUO information, the first line of an e-mail message must contain the abbreviation "OUO." There is no requirement to detail all of the information that is required in the front marking for hard copies (e.g., exemption name and number or guidance used, if applicable.) If the e-mail itself does not contain OUO, but an attachment contains OUO, the message must indicate the attachment is OUO (there is no specific language required.) (DOE M 471.3-1, Admin Chg 1, Chapter I, 3c.)
Additional Reference
See DOE M 471.3-1, Admin Chg 1, Chapter I, paragraph 3, for marking instructions. For samples of the above markings and others, see Marking OUO Documents.

Controlled Unclassified Information and E.O. 13556
When you hear the term Controlled Unclassified Information (CUI), it could mean one of two things. Currently, within DOE "Controlled Unclassified Information " or CUI is an overarching term used to refer to unclassified information that is identified and marked as sensitive (e.g., OUO and Unclassified Controlled Nuclear Information (UCNI)).
Controlled Unclassified Information is also used to describe information that will be identified and safeguarded under Executive Order (E.O.) 13556, Controlled Unclassified Information. E.O. 13556 mandates a Government-wide uniform program to identify and protect sensitive but unclassified information. At this time, policies for CUI under the E.O. are still being developed. No timetable has been set for implementation and implementation will take place over years. Until a National directive is issued and DOE issues its own implementing directive, DOE personnel must continue to follow the requirements for OUO (and UCNI) information.

Resources
The following are materials that may assist you in understanding OUO.
If you have questions regarding the DOE's OUO program, contact the Office of Classification's Outreach Program at (301) 903-7567 or outreach@hq.doe.gov.

2. DETERMINING WHETHER A DOCUMENT CONTAINS OFFICIAL USE ONLY INFORMATION. An unclassified document that is originated within a DOE/National Nuclear Security Administration (NNSA) office, produced by or for that office, or under the control of that office may contain OUO information. Any employee from an office with cognizance over such information may determine whether such a document contains OUO information.
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1. ACCESS TO OFFICIAL USE ONLY INFORMATION. Access to (a) documents marked as containing OUO information and (b) OUO information from such documents must only be provided to those persons who require the information to perform their jobs or other DOE-authorized activities. The responsibility for determining whether someone has a valid need for such access rests with the person who has authorized possession, knowledge, or control of the information or document and not on the prospective recipient.
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2. PHYSICAL PROTECTION REQUIREMENTS.
a. Protection in Use. Reasonable precautions must be taken to prevent access to documents marked as containing OUO information by persons who do not require the information to perform their jobs or other DOE-authorized activities (e.g., don't read an OUO document in a public place, such as a cafeteria, on public transportation).
b. Protection in Storage. Documents marked as containing OUO information may be stored in unlocked receptacles such as file cabinets, desks, or bookcases when Government or Government-contractor internal building security is provided during non-duty hours. When such internal building security is not provided, comparable measures should be taken, such as storing the documents in a locked room or other locked receptacle (e.g., a locked file cabinet, desk, bookcase, or briefcase).
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c. Reproduction. Documents marked as containing OUO information may be reproduced without the permission of the originator to the minimum extent necessary to carry out official activities. Copies must be marked and protected in the same manner as originals. Copy machine malfunctions must be cleared and all paper paths checked for papers containing OUO information. Excess paper containing OUO information must be destroyed as described below.
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d. Destruction. A document marked as containing OUO information must be destroyed by using a strip-cut shredder that produces strips no more than 1/4-inch wide or by any other means that provides a similar level of destruction that has been approved by the local security office. The decision to dispose of any DOE or NNSA document, whether it contains OUO information or not, must be consistent with the policies and procedures for records disposition.
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e. Transmission.
- By Mail-Outside of a Facility.
- Use a sealed, opaque envelope or wrapping and mark the envelope or wrapping with the recipient's address, a return address, and the words "TO BE OPENED BY ADDRESSEE ONLY."
- Any of the following U.S. mail methods may be used: First Class, Express, Certified, or Registered Mail.
- Any commercial carrier may be used.
- By Mail-Within a Facility. Use a sealed, opaque envelope with the recipient's address and the words "TO BE OPENED BY ADDRESSEE ONLY" on the front.
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(3) By Hand-Between Facilities or Within a Facility. A document marked as containing OUO information may be hand carried between or within a facility as long as the person carrying the document can control access to the document being transported.
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3. MARKING A DOCUMENT THAT CONTAINS OFFICIAL USE ONLY INFORMATION.
- Front Marking. The front marking includes:
- the applicable FOIA exemption number and related category name:
- o Exemption 3 - Statutory Exemption
- o Exemption 4 - Commercial/Proprietary
- o Exemption 5 - Privileged Information
- o Exemption 6 - Personal Privacy
- o Exemption 7 - Law Enforcement
- o Exemption 8 - Financial Institutions
- o Exemption 9 - Wells),
- the name and organization of the employee making the determination,
- the date of the determination was made
- and the guidance used if the determination was based on guidance. (NOTE: The guidance referred to here is guidance issued under paragraphs 5a(3), 5a(4), or 5b(2) of DOE O 471.3.) The employee making the determination ensures that the following marking is placed on the front of each document containing OUO information.

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Examples of Exemption 3 OUO information/documents:
- Federal Technology Transfer Act. Requires a Federal Agency to protect any commercial and confidential information that results from a Cooperative Research and Development Agreement with a non-Federal party for a period of 5 years after its development.
- Export Administration Act (for nuclear information, the Atomic Energy Act). Allows for the control of technology and other information whose foreign release requires an export license [known as Export Controlled Information (ECI)]. Of particular interest to DOE is sensitive nuclear technology described in the Atomic Energy Act.
- Other Statutes. Many other statutes also specifically exempt other kinds of information from disclosure; therefore, it is impossible to provide a definitive list here. The following are examples of other exemption 3 statutes that may apply to certain organizations within DOE:
- Patent Act (patent applications)
- Procurement Integrity Act (source selection information)
- Technical Data Statute (Department of Defense technical data)
- Internal Revenue Code (tax information)
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Examples of Exemption 4 OUO information/documents:
- Trade secrets (including inventions and discoveries).
- Commercial or financial information in connection with bids, contracts, or proposals and other related information received in confidence. Included is foreign ownership, control, or influence information.
- Statistical data and commercial or financial information concerning contract performance, income, profits, losses, and expenditures, if offered and received in confidence from a contractor or potential contractor. This includes business sales statistics, research data, technical designs, customer and supplier lists, overhead and operating costs, and information on financial conditions.
- Information dealing with scientific and manufacturing processes or developments concerning technical or scientific data or other information submitted with a contract proposal or as part of a report while the contract is in progress.
- Agency credit card numbers and bank account numbers.
- Information relating to the security of commercial entities performing work for the Government.
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Examples of Exemption 5 OUO information/documents:
- Draft or final documents that contain advice, opinions, or recommendations on new or revised Government decisions and policies, regardless of whether prepared by Federal employees, contractors, consultants, etc.
- Evaluations of contractor performance and their products and services by DOE personnel.
- Information of a speculative, tentative, or evaluative nature concerning proposed plans to procure, lease, or otherwise acquire and dispose of materials, real estate, facilities, or functions when such information would provide undue or unfair competitive advantage to private personal interests or would impede legitimate Government functions.
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Examples of Exemption 6 OUO information/documents:
- Personal details (e.g., social security number, citizenship data, date of birth, marital status, religious affiliation, sexual orientation or associations, medical conditions, criminal history, financial data).
- Performance appraisal/evaluation reports.
- Evaluation of candidates for employment or security clearances.
- Personnel matters in which administrative action, including disciplinary action, may be taken.
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Examples of Exemption 7 OUO information/documents:
- Statements of witnesses and other material developed during the course of an investigation and all materials prepared in connection with related Government litigation or adjudicative proceedings.
- The identity of firms or individuals being investigated for alleged irregularities involving contracting with DOE when no indictment has been obtained or no civil action has been filed against them by the United States.
- Information obtained in confidence, expressed or implied, in the course of a criminal investigation by a criminal law enforcement Agency or a lawful national security intelligence investigation conducted by an authorized Agency or an office within DOE. National security intelligence investigations include background security investigations and those investigations conducted for the purpose of obtaining affirmative or counterintelligence information.
- Information from which a confidential source may be identified.
- Law enforcement manuals and guidelines.
- Information concerning homemade weapons that could assist a criminal element and might result in harm to individuals or property.
- Security measures to protect Federal property and personnel.
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Examples of Exemption 9 OUO information/documents:
- Geological information
- Geothermal well BTU production
- Ground water inventories and well yields
- Natural gas reserves
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b. Page Marking. The employee making the determination must ensure that the words "Official Use Only" (or "OUO" if space is limited) are placed on the bottom of each page or, if more convenient, on just those pages containing the OUO information.
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f. Transmittal Document. A document that (1) transmits an attachment or enclosure marked as containing OUO information and (2) does not itself contain classified or controlled information must be marked on its front as follows to call attention to the presence of OUO information in the attachments or enclosures.

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c. Marking E-mail Messages. The first line of an e-mail message containing OUO information must contain the abbreviation "OUO" before the beginning of the text. If the message itself is not OUO but an attachment contains OUO information, the message must indicate that the attachment is OUO. The attachment must have all required OUO markings.
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OUO Front and Page Marking Example
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