31 Dec 2026

Varonis is pulling the plug on on-prem. ProLion isn’t.

Learn how to keep your data →
For AI teams
Industries
Healthcare

Your Best AI Data Is On-Prem. So Is Your Biggest Roadblock.

Know exactly which data is safe for AI, lock down what isn’t, and get security to say yes, all without sending a byte to the cloud.

Splunk
Microsoft Sentinel
Elastic
IBM QRadar

Syslog CEF and REST, into the tool you already run

The same question, twice.

Nothing about the agent changes. What changes is what it is allowed to find.

Before

What are the salary bands for the leadership team?

Here is what I foundFrom\\fs01\hr\comp\2026\bands_draft.xlsx— a file in a folder that was opened to “Everyone” during a reorganization in 2019 and never closed.

Nobody broke in. The agent used the permissions it was given, on a folder nobody had looked at in seven years.

After

What are the salary bands for the leadership team?

Nothing you can accessThe file is classified as personnel data and reachable only by HR. The group that opened it to everyone was closed, and the change is on record.

The permissions were fixed before the rollout widened — which is the only place this problem can be fixed.

66 %
of enterprises delayed or canceled a Copilot rollout over data exposure.
73 %
worry that AI is already surfacing sensitive information internally.
40 %
delayed by three months or more over oversharing.

Industry figures, not ProLion measurements. Sources: CoreView, July 2026, 279 Microsoft 365 decision-makers; Gartner, GenAI rollout survey.

See it running

See what the agent can actually reach.

1:05

Let’s solve your data challenges.

Connect with our engineers to find the right approach for your infrastructure.

What has to be true before you widen it.

You know what is in the corpus
Personal, health and financial data recognized in the files themselves, before anything indexes them.
You know who can reach it
Effective permissions through every nested group — the same rights the agent will inherit.
The open shares are closed
Remediation by changing permissions and labels, with the before-and-after on record.
The corpus never leaves
Classification runs on your own hardware. No file is sent to a cloud service to be read.
The agent is an identity
It acts continuously, at machine speed, with delegated rights. Every file operation is attributed to it.
Odd behavior is caught
A baseline does not care whether the account belongs to a person or to an agent.

An annual access review does not describe an agent.

Permissions change daily and reviews happen once a year. An agent works through a share faster than a person could in a month — so the answer has to be computed when the question is asked.

Before
Find what is reachable
Effective permissions per file, ranked by the sensitivity behind them
Before
Close the open shares
Remediation with the before-and-after on record
During
Record what the agent reads
Every file operation attributed to the account or service principal
During
Catch the agent that goes wrong
Behavior baselining, whoever the account belongs to
Always
Keep the data in your building
Classification and analysis on your own hardware, dark sites included

Talk to an engineer who knows your data.

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