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World desk5 min

What Should an MLS Data-Sharing Agreement Include? A Practical Checklist

A practical checklist for defining MLS data access, permitted use, display rights, security, vendor oversight, compliance reviews, and exit terms.

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An MLS data-sharing agreement should spell out exactly which data may be accessed, by whom, for what purpose, under which access model, and what happens to the data when access ends. It should also cover display and redistribution, security and privacy, vendors, compliance reviews, incident response, and how the agreement interacts with the MLS’s current rules. The right terms depend on the specific MLS, jurisdiction, and use; IDX, VOW, broker back-office, and participant-data access are not interchangeable permissions.

Start by defining the access model

Before drafting operational terms, identify the arrangement the parties intend to authorize. The agreement should not use a broad label such as “MLS access” as a substitute for defining the actual audience, activity, and data involved.

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Access model What the agreement needs to establish
IDX Which display activity and audience are permitted, and which current MLS rules govern them.
VOW Whether the service operates as a VOW for a participant, what consumer terms apply, and how participant supervision and accountability work.
Broker back-office Which internal business uses are permitted and whether any display or consumer access is excluded.
Participant data access or another arrangement Who qualifies for access, what the data may be used for, and whether any further use or transfer is allowed.

This is a scoping framework, not a statement of universal rights for any category. The MLS’s current rules determine the permissions. RESO’s Real Estate Data Sharing and Alignment recommends completing the licensing agreement before the data share begins and addressing its initiation, maintenance, use, and potential shutdown. NAR’s VOW policy page identifies January 1, 2026; the U.S. Department of Justice Antitrust Division also publishes a VOW policy. Neither VOW policy should be read as a universal rule for other access models.

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Identify the parties and precisely describe the data

Name the MLS, the participant or broker receiving access, and every service provider that will handle the feed. Define the covered material rather than relying on a general reference to “MLS data.” Specify, as applicable:

  • Permitted fields and any excluded, confidential, or sensitive fields.
  • Feed or delivery format, geography, and update frequency.
  • Whether the agreement covers listings, related content, or other identified data elements.
  • Any applicable data dictionary, technical specification, or schedule that defines the feed.

Attach or identify the relevant specification and explain how changes to it will be communicated and handled. A specific field list or refresh schedule cannot be assumed from the access-model label alone.

Limit the license to a defined purpose

State who may access the information and the precise business purpose for which it may be used. Separately address whether the recipient or its provider may display, deliver, cache, transform, or create derived information from the data. If onward transfer or sublicensing is permitted, identify to whom and on what conditions; otherwise, prohibit it expressly.

For a VOW partner operating on a participant’s behalf, NAR’s policy describes access in connection with operating the VOW and places supervision and accountability on the participant. The agreement should reflect the applicable policy and should not imply that a provider may make independent use of the data.

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Set display, attribution, and data-integrity rules

For any permitted display or delivery, specify where the information may appear and the applicable attribution, disclaimers, timing, refresh, and removal requirements. Clarify whether and how information may be changed, combined with other information, or presented as derived content.

The DOJ Antitrust Division’s VOW policy says MLS content displayed on a VOW may not be changed from the content supplied, while identified supplemental information may be added. It also limits display of specified participant-only data in VOWs. Those are VOW-specific provisions, not default terms for every MLS data arrangement.

Address consumer terms when the service is consumer-facing

If the access model and governing rules require consumer registration or agreement to terms, state how the service will obtain and retain the required acceptance. Do not copy VOW consumer terms into another model without confirming that they apply.

Under the DOJ VOW policy, VOW terms include acknowledgement of a lawful broker-consumer relationship, personal noncommercial use, a bona fide real-estate interest, no copying or redistribution, and acknowledgement of the MLS’s database ownership and copyright. Confirm the current MLS requirements and the terms applicable to the specific service.

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Make security and privacy obligations operational

Describe controls in terms that the parties can implement and verify. Depending on the data and service, address:

  • Authentication, authorization, least-privilege access, and credential handling.
  • Appropriate encryption and storage safeguards, along with audit logging and security review.
  • Controls against scraping and other unauthorized access, reproduction, or use.
  • What personal information is collected, why it is collected, who can access it, how long it is retained, and how it is protected.
  • Return or deletion of personal information and other covered data when access ends.

The DOJ VOW policy calls for reasonable efforts to monitor for and prevent scraping or other unauthorized access, reproduction, or use in the VOW context. Local MLS rules may impose additional requirements. Define the controls for the actual service rather than treating that VOW provision as a universal security specification.

Define vendor access and accountability

List the providers that may receive or handle the data, describe the tasks they may perform, and require equivalent confidentiality and security obligations. State whether MLS or broker approval is required before adding or replacing a provider, how a provider’s access will be removed, and that the provider cannot use the data for an independent purpose.

Address who supervises provider activity and who remains accountable for compliance where the applicable policy assigns that responsibility. NAR’s VOW policy and CVR MLS’s Section 10.1, VOW Defined, provide VOW-related examples of a partner acting for a participant under participant supervision and accountability. CVR MLS’s provision is a local rule example, not a universal standard.

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Specify monitoring, audits, and incident response

Give the parties a workable process for checking compliance. Define the records the recipient and its providers must keep and make available, the scope and notice for a review, and how confidential information will be handled. The DOJ VOW policy provides for MLS access to a VOW for compliance verification and monitoring; the agreement should implement any applicable review right without promising access beyond the governing rules.

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For suspected unauthorized access or disclosure, specify prompt notice, cooperation, preservation of evidence, mitigation, and responsibility for response costs. Set out whom to notify and how the parties will coordinate their response.

Plan for suspension, termination, and data exit

State the agreement’s duration, renewal process, and method for amendments. Identify suspension triggers and termination rights, and say whether a wind-down period is allowed. At suspension or termination, explain how access and credentials will be disabled and whether the recipient and providers must return or delete data, copies, and personal information. Address any permitted retention and how it will be protected.

Allocate risk and resolve document conflicts

Set out each party’s compliance responsibilities, how data accuracy and update handling are addressed, and any negotiated provisions for claims, indemnification, liability limits, insurance, disputes, governing law, and notices. These terms require deal-specific negotiation and local legal review; the policies described here do not establish a universally appropriate allocation.

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Identify the controlling MLS rules, feed specification, and any separate participant or consumer terms. Explain how policy updates will be handled and which document controls if the MLS rules, data license, and vendor contract conflict. Check the particular MLS’s current documents and applicable state law before relying on a template.

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