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• Cybersecurity Glossary

What is DLP (Data Loss Prevention)?

Data Loss Prevention (DLP) is a set of technologies and practices that detect and prevent the unauthorized exposure, transfer or exfiltration of sensitive data. It works by identifying confidential information such as personal, financial or intellectual property data, monitoring it across networks, endpoints and cloud, and enforcing policies that block or control its movement. DLP helps organizations prevent Data breaches and comply with regulations such as GDPR. This page explains how DLP works, its types, the policies and compliance it supports, and how Teldat delivers DLP within be.Safe Pro.

1Data Loss Prevention defined2How Data Loss Prevention works3Types of DLP4Data at rest, in motion and in use5DLP policies and enforcement6DLP, GDPR and compliance7DLP versus firewall and NGFW8Data Loss Prevention with Teldat9Frequently asked questions – FAQ’s

Data Loss Prevention (DLP) defined

Data Loss Prevention (DLP) is a discipline within cybersecurity focused on making sure sensitive data does not leave an organization in ways it should not. It combines technologies, policies and processes that detect, monitor and block the unauthorized exposure, movement or exfiltration of confidential information, whether that loss would be accidental or malicious.

The data DLP protects is the information an organization cannot afford to lose or expose: personal data about customers and employees, financial records such as card numbers, health information, and intellectual property like source code or business plans. Much of this is also regulated, so protecting it is both a security and a compliance requirement.

At its core, DLP answers a simple question in real time: is this piece of data allowed to go where someone is trying to send it? To do that it first has to recognize what is sensitive, then watch how that data moves, and finally enforce the rules. When DLP is delivered at the network level, this happens as traffic flows toward the internet and cloud, which is where Teldat integrates DLP as one of the capabilities of be.Safe Pro.

How Data Loss Prevention (DLP) works?

DLP follows a consistent logic no matter where it is deployed: identify what is sensitive, monitor where it goes, and enforce what is allowed. These are the stages that make it work.

1
Identify and Classify sensitive data
DLP begins by recognizing what counts as sensitive, using techniques such as pattern matching for card or ID numbers, keyword lists, and data fingerprinting. Accurate classification is the foundation: the system can only protect what it can identify, so this step determines how effective everything that follows will be.
2
Monitor data Movement
Once data is classified, DLP watches it across the organization, in storage, as it crosses the network and as people use it on their devices. This continuous visibility is what lets the system notice when sensitive information is about to move somewhere it should not, before the loss actually happens.
3
Enforce Policies in real time
When an action would break a rule, such as sending protected data to an external service, DLP acts: it can block the transfer, warn the user, alert an administrator or simply log the event. Enforcement turns passive monitoring into active protection, stopping leaks as they are attempted.
4
Report and Audit
DLP records what it sees and does, producing the logs and reports that show which data was protected and which policies fired. This audit trail is essential for investigating incidents and for demonstrating to regulators that controls are in place and working, connecting security directly to compliance.

Types of DLP (Data Loss Prevention)

DLP is commonly categorized by where it protects data. Each type addresses a different part of the environment, and many organizations combine them for full coverage.

1
Network DLP
Network DLP monitors data in motion as it travels across the corporate network and out toward the internet. Deployed at exit points such as the security gateway, it inspects traffic to detect and stop sensitive information leaving the organization, making it a natural fit for a network security platform.
2
Endpoint DLP
Endpoint DLP runs as an agent on user devices, controlling local actions that could cause a leak, such as copying files to USB drives, printing or moving data between applications. It protects data in use directly where people work, covering actions that never touch the network.
3
Cloud DLP
Cloud DLP protects sensitive data stored and shared in cloud and SaaS applications, an area that has grown as organizations move to the cloud. It monitors uploads, downloads and sharing in services like collaboration and storage platforms, extending data protection beyond the traditional network.
4
Integrated DLP in a Security platform
Rather than a standalone tool, DLP is increasingly delivered as a capability within a broader security platform, working alongside firewalling, web filtering and threat inspection. This integration is how Teldat provides network DLP inside be.Safe Pro, protecting data as part of the same service that secures traffic.

Data at rest, in motion and in use

DLP protects data in three states, and understanding them clarifies what each type of DLP actually does. The table sets out the three states and how they are protected.

Data state What it means How DLP protects it
Data at rest Stored in databases, file servers or the cloud Discovers and classifies stored sensitive data, controls access
Data in motion Moving across the network or to the internet Inspects traffic and blocks improper transfers, network DLP
Data in use Being accessed or handled on a device Controls actions like copy, print and USB, endpoint DLP

Where network DLP fits: the moment of greatest risk for many organizations is data in motion, when information leaves the network toward the internet or a cloud service. Network DLP addresses exactly this point, inspecting outbound traffic at the gateway. Because Teldat be.Safe Pro sits in that path as branches and users reach the internet, it is well placed to control the volume and type of information leaving the internal network.

DLP (Data Loss Prevention) policies and enforcement

DLP is only as good as the policies that drive it. These define what is sensitive, who can do what with it, and what happens when a rule is broken. The following are the building blocks of effective DLP policy.

1
Define what is Sensitive
Policy starts by classifying the data that matters, from personal and financial records to intellectual property, often mapped to regulations. Clear definitions of what is protected, and at what level, give the DLP system the criteria it needs to make consistent decisions across the organization.
2
Set Rules for handling and sharing
Rules specify who may access sensitive data and how it can move, for example blocking protected files from being emailed externally or uploaded to personal cloud accounts. Well designed rules balance protection with productivity, stopping risky actions without obstructing legitimate work.
3
Choose the Enforcement action
For each rule, policy sets what happens on a violation: block outright, warn and allow the user to proceed, quarantine, or log for review. Matching the response to the sensitivity of the data keeps strong control over the most critical information while avoiding needless friction elsewhere.
4
Manage Centrally and consistently
Policies should apply uniformly across every site and user, which is far easier from a single management console. Central control ensures the same protection everywhere and lets policies be updated quickly as needs change, a key advantage of delivering DLP through a unified platform.

DLP, GDPR and Compliance

One of the strongest reasons organizations adopt DLP is regulatory compliance. Data protection laws make safeguarding sensitive information a legal duty, and DLP provides both the controls and the evidence.

1
Meeting GDPR and data protection Law
Regulations such as the GDPR require organizations to protect personal data and prevent unauthorized disclosure. DLP directly supports these obligations by identifying regulated data and stopping it from leaving improperly, turning a legal requirement into an enforced technical control.
2
Avoiding Breaches and penalties
A data breach can bring heavy fines and lasting reputational damage. By preventing sensitive data from leaking in the first place, DLP reduces both the likelihood and the impact of such incidents, protecting the organization from costs that far exceed the price of the control itself.
3
Demonstrating Control with evidence
Compliance is not only about having controls but proving they work. DLP produces logs and reports showing what data is protected and how policies are enforced, giving auditors and regulators the demonstrable evidence they require, and giving the organization confidence in its posture.
4
European jurisdiction and Data sovereignty
For European organizations, keeping data and its protection under European jurisdiction supports both GDPR compliance and digital sovereignty. Choosing a DLP solution operated within Europe aligns data protection with the legal framework it must answer to, an advantage of Teldat’s European approach.

DLP (Data Loss Prevention) vs Firewall and NGFW

DLP is sometimes confused with firewalls, but they protect against different things and work best together. A firewall governs connections; DLP governs the sensitive data within them. The table makes the distinction clear.

Dimension Data Loss Prevention Firewall and NGFW
Main focus Sensitive data and where it goes Connections and traffic control
Question answered Is this data allowed to leave? Is this connection allowed?
Direction of concern Mainly outbound, data leaving Inbound and outbound traffic
Inspects Content and context of the data Ports, protocols, apps and threats
Together in a platform Protects data within allowed traffic Controls which traffic is allowed

Better together: a firewall might allow a connection to a cloud service while DLP inspects what is actually being sent and blocks it if it carries protected data. The two are complementary layers, and in a platform such as Teldat be.Safe Pro they operate together, with NGFW controlling traffic and DLP protecting the sensitive data inside it, all from one service.

Data Loss Prevention (DLP) with Teldat

Teldat delivers DLP as one of the capabilities of be.Safe Pro, its cloud security service within a SASE platform. Rather than a separate product, DLP works alongside Secure Web Gateway, NGFW and threat protection, controlling sensitive data as it moves from the internal network toward the internet and cloud, all managed centrally and under European jurisdiction.

1
DLP within be.Safe Pro
be.Safe Pro includes Data Loss Prevention among its security capabilities, alongside IPS/IDS, antivirus, sandbox, URL reputation and SSL scanning. This means data protection is built into the same cloud service that secures web and network traffic, rather than bolted on as a separate tool.
2
Controlling data Leaving the network
be.Safe Pro controls the volume and type of information moving from the internal network to external applications, so staff can connect to cloud storage and third parties while the service prevents leaks of confidential data. This is network DLP applied exactly where data exits toward the internet.
3
Working with SWG, NGFW and SSL Inspection
DLP in be.Safe Pro is reinforced by SSL inspection, which decrypts encrypted traffic so sensitive data cannot slip out hidden inside it, and by the NGFW and Secure Web Gateway that control the surrounding traffic. Together they give layered protection that a standalone DLP tool could not match.
4
Central Management and granular services
be.Safe Pro is managed from a single cloud console and offers its capabilities granularly, so organizations can enable DLP and the specific services they need. Policies apply consistently across branches and remote users, deployed quickly with zero touch provisioning and no specialized staff required.
5
European jurisdiction and GDPR Support
As a European manufacturer, Teldat operates be.Safe Pro under European jurisdiction, aligning data protection with GDPR and digital sovereignty. For organizations that must keep regulated data within Europe, having DLP delivered from a European platform is a meaningful advantage.

Why integrated DLP matters: data does not leak in isolation; it leaves through the same web and network traffic that other controls already inspect. Because Teldat builds DLP into be.Safe Pro alongside SWG, NGFW and SSL inspection, organizations protect sensitive data at the point it would exit, within one cloud service, managed centrally and operated under European jurisdiction in support of GDPR.

FAQ’s about Data Loss Prevention (DLP)

❯ What is DLP in simple terms?

Data Loss Prevention, or DLP, is a way of stopping sensitive information from leaving an organization when it should not. It works like a checkpoint that watches data as it moves, whether someone tries to email a confidential file, upload it to a personal cloud account or copy it to a USB drive, and blocks or flags actions that break the rules. DLP first identifies what counts as sensitive, such as customer records, card numbers or intellectual property, and then enforces policies that control how that data can be used and shared, protecting the organization from leaks and helping it meet regulations.

❯ How does Data Loss Prevention work?

DLP works in three broad steps: identify, monitor and protect. First it identifies and classifies sensitive data, using techniques such as pattern matching, keywords and fingerprinting to recognize things like personal or financial information. Then it monitors that data across its three states, at rest in storage, in motion across the network, and in use on devices. Finally it enforces policies: when an action would breach a rule, such as sending protected data outside the company, the DLP system can block it, alert an administrator or log the event. In network DLP this inspection happens as traffic flows toward the internet.

❯ What are the main types of DLP?

DLP is usually grouped by where it protects data. Network DLP monitors data in motion across the corporate network and its exit points to the internet, inspecting traffic to stop sensitive information leaving. Endpoint DLP runs on user devices to control actions like copying to USB drives or printing. Cloud DLP protects data stored and shared in cloud and SaaS applications. Many organizations combine these, and network based DLP is often delivered at the security gateway, which is where Teldat integrates DLP within be.Safe Pro as traffic heads to the internet.

❯ Why is DLP important for compliance?

DLP is central to compliance because regulations such as the GDPR require organizations to protect personal and sensitive data and to prevent unauthorized disclosure. A data breach can bring heavy fines and reputational damage, so being able to demonstrate that controls are in place to stop data leaving improperly is both a legal and a business need. DLP provides those controls and the visibility and reporting to prove them, helping organizations meet obligations under GDPR and other frameworks while reducing the risk and cost of a breach.

❯ What is the difference between DLP and a firewall?

A firewall controls whether traffic is allowed in or out based on factors like ports, protocols, addresses and, in a Next Generation Firewall, applications and threats. DLP is concerned specifically with the content of the data itself and whether sensitive information is leaving improperly. A firewall might permit a connection to a cloud service, while DLP inspects what is being sent and blocks the transfer if it contains protected data. The two are complementary, and in a modern security platform such as Teldat be.Safe Pro they work together, with NGFW controlling traffic and DLP protecting sensitive data within it.

❯ How does Teldat deliver DLP?

Teldat delivers DLP as one of the capabilities of be.Safe Pro, its cloud security service within a SASE platform. Alongside Secure Web Gateway, Next Generation Firewall, IPS/IDS, antivirus, sandbox, URL reputation and SSL scanning, be.Safe Pro includes DLP to control the volume and type of information moving from the internal network to external applications and the internet. This lets organizations prevent leaks of confidential data as branches and remote users connect to the cloud, managed centrally from a single console and operated under European jurisdiction, supporting GDPR compliance.

Protect your sensitive data with Teldat

be.Safe Pro brings Data Loss Prevention (DLP) together with Secure Web Gateway, NGFW and threat protection in one cloud service, controlling data leaving the network, managed centrally and operated under European jurisdiction in support of GDPR.