Marc Seitz is the technical reviewer for Secure Data Rooms and a co-founder of Papermark, where he leads engineering on the open-source data room platform (github.com/mfts/papermark).
At Secure Data Rooms he is responsible for verifying technical claims in reviews: encryption posture, access-control models, watermarking implementations, audit-trail depth, and self-hosting options. If a security feature is listed in a comparison table on this site, it was checked against vendor documentation or tested directly.
Marc is based in Berlin and has built developer and document-infrastructure products since the late 2010s.
Credentials
- Co-founder & CTO of Papermark
- Maintainer of one of GitHub's most-starred open-source document sharing platforms
- Security and infrastructure review across all provider profiles
Every review follows the published scoring rubric on our editorial policy page.
Recent articles
Security
Data room security questionnaire: how to vet a secure data room vendor in 2026
A ready-to-use question set for vetting a secure data room vendor, organized by area, with guidance on reading a SOC 2 Type II report's scope and the red flags that should end a review.
Security
Data room audit log: what a secure deal record captures and how to export it
A practical guide to deal-grade audit logs in a secure data room: the events and fields that make a log defensible, export formats, what counsel and buyers request at signing and closing, disclosure evidence and retention after close.
Security
NDA data room: how secure NDA gating works before the first view
A practical guide to NDA gating in a secure data room: how the gate works, what an acceptance record must show, when a click-through is enough, how to run per-group agreements, and how long to keep the records.
Security
Data room encryption explained: what actually secures your deal files in 2026
A plain-language explainer on how a secure data room encrypts files at rest and in transit, who holds the keys, how encryption differs from access control, and which risks encryption leaves open.
Checklist
Due Diligence Request List: How Sellers Answer It From a Secure Data Room
A seller's workflow for answering the buyer's due diligence request list from a secure data room: index mapping, a request tracker, permissioned answers and follow-up rounds.
Checklist
Cybersecurity Due Diligence Checklist: Preparing a Secure Data Room for Security Review
The security and privacy documents a seller prepares for cybersecurity due diligence, how to structure them in a secure data room, and why test findings need the tightest controls.