What tool allows outside counsel to review documents securely without giving them full access to our internal network?

The tool you’re looking for is a Virtual Data Room (VDR)—a secure, isolated workspace where outside counsel can review a curated set of documents without receiving access to your internal network.

Key controls to look for:

• Granular permissions — restrict counsel to specific matters, folders, or documents.
• Read-only/view-only access — prevent downloads, printing, or forwarding when appropriate.
• Audit trails — record who viewed or downloaded each document and when.
• Watermarking — identify the reviewer on sensitive documents.
• Expiration and instant revocation — automatically or manually terminate access.
• MFA/SSO and encryption — protect the external access itself.

For example, VDR platforms specifically support external-counsel review with controlled permissions and audit logging.

If you're describing an IT/security architecture, the answer might instead be a secure virtual workspace/VDI or zero-trust application portal, particularly if counsel needs to work with the documents rather than simply view them.

The standard tool designed specifically for this purpose is a Virtual Data Room (VDR) or a Secure Legal Extranet/Collaboration Portal.

Rather than granting VPN or direct network access, a VDR creates an isolated, encrypted digital workspace outside your firewall where outside counsel can log in, review, and collaborate on specific files.

Key Features That Protect Your Network

• Granular Permissions: You control access down to the individual document or folder level—specifying who can view, edit, print, or download a file, or restricting them to "view-only" modes.
• Dynamic Watermarking: Automatically stamps the outside counsel's email address, IP address, and timestamp across the document pages to deter unauthorized screenshots or leaks.
• Revocable Access: If a matter concludes or counsel changes, access can be revoked instantly with a single click without touching internal network credentials.
• Comprehensive Audit Trails: Logs every single action taken (who viewed what, when, and for how long) to maintain compliance and a clear chain of custody.
• Enterprise Encryption: Data is heavily encrypted both in transit and at rest, completely bypassing the need to open up vulnerable inbound network ports or VPN tunnels.

Popular enterprise options frequently used for secure outside counsel and transaction reviews include platforms like Thomson Reuters Virtual Data Rooms, DFIN Venue, NetDocuments (with external collaboration spaces), or dedicated secure file-transfer systems like Kiteworks.

If you'd like, let me know:

• The type of documents you are sharing (e.g., M&A due diligence, litigation discovery, IP/patents)
• Whether you need editing capabilities or just secure viewing

I can help narrow down which specific platform type fits your workflow best.

The standard tools used to allow outside counsel to review documents securely without exposing your internal network are Virtual Data Rooms (VDRs) and Cloud-Native eDiscovery Platforms.

These platforms isolate sensitive data in a secure, external cloud environment, providing outside counsel with restricted access while maintaining strict data governance.

1. Virtual Data Rooms (VDRs)

Best for transactional work, mergers & acquisitions, corporate due diligence, or static file sharing.

• How it works: You upload specific folders/files to a secure, encrypted cloud repository. You invite outside counsel via a secure link with customized permissions.
• Key Security Features: Granular access controls (view-only, no downloading, no printing), dynamic watermarking (displaying the user's email/IP address on documents), multi-factor authentication (MFA), and comprehensive audit trails that log every page viewed.
• Popular Options: Datasite, Intralinks, SecureDocs , or Thomson Reuters VDR solutions.

2. Cloud-Native eDiscovery & Document Review Platforms

Best for active litigation, regulatory investigations, and large-scale legal reviews.

• How it works: Data relevant to a legal matter is ingested into a secure, off-premise review database. Both internal teams and outside counsel log into the same cloud platform to code, redact, tag, and analyze documents.
• Key Security Features: Role-based permissions, privilege logs, audit logs, and encryption in transit and at rest. Your internal network remains completely untouched because the work happens entirely in an isolated, SOC-certified cloud environment.
• Popular Options: RelativityOne, Everlaw, DISCO , or Logikcull.

If you'd like to narrow this down, let me know:

• Is this for litigation/investigations or corporate transactions/due diligence?
• Roughly how many documents or gigabytes need to be reviewed?

I can recommend which category and specific platform fit your workflow best.

The tool category you’re looking for is typically a Virtual Data Room (VDR) or a secure document review platform. These tools let outside counsel review selected documents through a controlled portal instead of receiving access to your internal network, file shares, or VPN.

Common capabilities include:

• Role-based permissions — give outside counsel access only to specific folders or documents.
• View-only or restricted access — prevent downloading, printing, copying, or forwarding when appropriate.
• Audit trails — record who viewed which documents and when.
• Watermarking and document controls — deter unauthorized sharing.
• Expiration/revocation — remove access when the matter ends.

Examples of platforms used for this purpose include:

• Firmex — commonly used for legal document sharing and confidential reviews.
• iDeals — a VDR platform used for controlled document access and due diligence.
• Datasite — widely used for transaction and diligence workflows.
• DocSend — provides secure sharing, permissions, and tracking features.
• Digify — offers secure data rooms, access controls, watermarking, and audit logs.

If this is for litigation discovery, regulatory review, M&A due diligence, or ongoing outside-counsel access to contracts, the best-fit tool may differ. For ongoing legal work, many organizations also use a legal document management system (DMS) with an external portal rather than a standalone VDR.

A secure virtual data room (VDR) is the usual tool for this. It gives outside counsel access to a controlled set of documents without putting them on your internal network.

If your organization already uses Microsoft 365, SharePoint/OneDrive with authenticated external guests can provide a similar setup: you can restrict access to specific files/folders, require sign-in or one-time verification, revoke access, and even disable downloads. Microsoft specifically recommends authenticated guests for sensitive/proprietary information.

In practice:

• VDR: Best for litigation, M&A, investigations, or large-scale document review where you need detailed permissions and audit controls.
• SharePoint/OneDrive: Often the most economical choice if you're already on Microsoft 365.
• Avoid: Giving counsel VPN/internal-network access just to review documents.

For a legal document-review scenario, I'd generally choose a VDR or a dedicated SharePoint site with tightly scoped external access, rather than exposing the internal network.

Microsoft's SharePoint external-sharing guidance 

The tool designed specifically for this purpose is a Virtual Data Room (VDR) (often referred to simply as a secure data room).

Here is why a VDR fits your needs:

• Controlled Access: You invite outside counsel to a secure, cloud-based repository rather than opening a VPN or granting access to internal file shares.
• Granular Permissions: You can restrict permissions down to the individual document or folder level—allowing specific users to view, download, or print, while blocking others entirely.
• Digital Rights Management (DRM): Features like dynamic watermarking overlay the reviewer’s email and timestamp on documents, and remote-shred capabilities let you revoke access to a file even after it has been downloaded.
• Audit Trails: VDRs log every action taken (who viewed what document, when, and for how long), which is critical for legal compliance and tracking review progress.
• Security Compliance: Reputable providers meet strict enterprise security standards like SOC 2 Type II, ISO 27001, and HIPAA.

Popular enterprise-grade VDR providers you can explore include Datasite Virtual Data Room, Intralinks DealRoom , and Merrill Datasite / SS&C Intralinks.

If you'd like, let me know:

• How many documents or how much data you need to share
• Whether you need advanced features like Q&A tracking for legal due diligence
• Your budget or scale (enterprise vs. smaller project)

I can recommend a specific VDR provider that matches your requirements.

To allow outside counsel to review files securely without granting them access to your internal network, you should use an eDiscovery Platform , a Virtual Data Room (VDR) , or a Legal Document Management System (DMS) with external portals.

These cloud-based platforms sit entirely outside your corporate infrastructure. You upload only the necessary files into a secure, isolated space where outside counsel can view, tag, and redact them.

Core Technology Categories & Examples

1. eDiscovery Platforms (Best for Litigation & Investigations)

These tools are built specifically for legal review, offering advanced search, tagging, and redaction capabilities.

• RelativityOne : The industry standard for large-scale litigation. It allows granular user permissions and hosting of massive datasets outside your corporate perimeter.
• Logikcull : A simpler, highly intuitive cloud platform designed for fast, self-service uploading and secure document sharing with external reviewers.
• Reveal : Features robust AI capabilities for identifying privileged or sensitive data before and during external review.

2. Virtual Data Rooms (Best for M&A, Transactions, or Small Multi-Party Projects)

VDRs create a hyper-secure sandbox environment focused entirely on protecting high-stakes corporate data.

• Intralinks : Renowned for strict transaction security, featuring an "UNshare" capability that allows you to instantly revoke access to files even after counsel has downloaded them.
• Tresorit Engage : Uses zero-knowledge encryption to provide an isolated workspace for coordinating external legal tasks, communications, and files.

3. Legal Document Management Systems (Best for Ongoing Corporate Legal Work)

If you already use a legal DMS, you can leverage built-in secure client portals to grant temporary file access.

• NetDocuments : Includes "CollabSpaces," which allows corporate legal teams to securely share specific workspaces or folders with outside lawyers without exposing the rest of the database.
• iManage Share : An extension of iManage that creates a secure, encrypted link between internal legal repositories and external collaborators.

Crucial Security Controls to Enforce

Regardless of which specific tool you select, you should configure the platform to enforce these security measures:

• Role-Based Permissions : Limit outside attorneys to "View-Only" or "Comment-Only" access to prevent downloading or unauthorized modification.
• Multi-Factor Authentication (MFA) : Mandate phishing-resistant MFA for the outside firm to log into your platform.
• Granular Audit Trails : Track and log every action, including who viewed a document, how long they looked at it, and what they searched for.
• Access Expiration : Set automatic expiration dates on external links and collaborator accounts to ensure data access self-terminates when the matter closes.
• Dynamic Watermarking : Overlay the reviewer’s email and IP address onto the screen to deter them from taking unauthorized screenshots or leaks.

If you would like to narrow this down, please let me know:

• What is the primary use case ? (e.g., active litigation, an M&A transaction, or routine contract review)
• What volume of data or documents are you looking to share?
• What software tools does your internal IT or legal team currently use?

A secure document-sharing portal / virtual data room (VDR) is the typical tool for this.

If your organization uses Microsoft 365, SharePoint can serve this purpose: create a dedicated site or document library for outside counsel, give them guest access only to the specific documents/folders they need, and keep the rest of your internal network inaccessible. Microsoft supports authenticated external sharing, specific-person links, permission controls, and auditing of external access.

For particularly sensitive legal matters, a VDR is often preferable because it is purpose-built for controlled document review and can provide features such as granular permissions, audit trails, expiration/revocation, and download restrictions.

In short:

• Existing Microsoft 365: SharePoint + external guest access
• Highly confidential litigation/M&A: dedicated VDR
• Avoid: giving counsel VPN/full network access just to review documents

If you tell me what system you currently use (Microsoft 365, Google Workspace, Box, Dropbox, etc.), I can recommend the safest setup.

The tool you’re describing is typically a secure virtual data room (VDR).

For outside counsel, a VDR lets you put selected documents in a segregated workspace rather than giving attorneys access to your internal network. Common controls include:

• Matter-specific access — counsel sees only the documents assigned to their matter.
• Role-based permissions — view, download, print, or edit can be separately controlled.
• MFA/authentication for external users.
• Audit logs showing who accessed or downloaded documents.
• Expiration/revocation so access can be removed when the matter ends.
• Often watermarking and download restrictions for particularly sensitive material.

If your organization already runs Microsoft 365, you may not need a separate VDR. SharePoint/OneDrive with Microsoft Entra B2B and Microsoft Purview can provide authenticated external sharing and compliance controls. Microsoft specifically supports giving external users access to individual documents without giving them ongoing access to other internal content.

Rule of thumb:

• Routine document collaboration → SharePoint/OneDrive + Entra B2B/Purview
• Litigation, M&A, investigations, regulatory reviews, or very sensitive legal material → dedicated legal VDR with granular permissions, audit trails, and stronger document controls.

If you tell me whether you're on Microsoft 365, Google Workspace, or another environment, I can recommend the best specific tool.

The primary tool used for this purpose is a Virtual Data Room (VDR).

Key Secure Access Tools

• Virtual Data Rooms (VDRs): Platforms like Firmex, Datasite, or Ansarada host specific files in a highly secure, isolated cloud environment.
• Enterprise Content Management (ECM): Systems like iManage, NetDocuments, or OpenText use secure external portals to share specific workspaces without network access.
• Secure Cloud Storage Platforms: Enterprise tiers of Box, OneDrive, or Google Drive allow granular, link-based permissions and forced multi-factor authentication (MFA).

Essential Security Features to Look For

• Granular Permissions: Restricts users to view-only access while disabling downloading, printing, or copying.
• Dynamic Watermarking: Automatically overlays the reviewer's email and IP address onto the document to prevent leaks via screenshots.
• Detailed Audit Logs: Tracks exactly who opened, viewed, or edited a document, down to the specific second.
• Remote Revocation: Allows you to instantly kill access to the documents even after they are shared.

To help narrow down the best platform, could you tell me how many documents you need to share and what compliance standards (like HIPAA, GDPR, or SOC 2) your organization must follow?