Investor Updates and Board Decks: Send Each Recipient Their Own Copy

Why investor material leaks quietly

Monthly updates, board decks and quarterly financials travel further than the distribution list. An angel forwards the update to a friend "for advice". A fund shares the deck with a co-investor. A board member's assistant saves it to a shared folder. Most of the time nothing bad happens. When numbers, runway or an acquisition conversation shows up in a newsletter or a competitor's hands, the question is always the same: whose copy was it?

Confidentiality clauses and "please don't forward" set expectations. They don't tell you which of fifteen recipients moved the file.

Related: how to share a pitch deck with investors without leaks covers fundraising decks sent to many funds. This guide is about the recurring material you send to people who are already on your cap table or board.

What to mark

Focus on the files that carry the sensitive part:

1. Board decks (PDF exports of your slides).
2. Monthly or quarterly investor updates when you send them as PDFs rather than plain email.
3. Financial summaries and KPI one-pagers attached to those updates.
4. Screenshots of dashboards you paste into updates, exported as images.

Plain-text email bodies are hard to trace. If the sensitive numbers live in the email itself, consider moving them into an attached, marked PDF.

A simple per-recipient workflow

1. Assign one identifier per recipient (per person, or per firm if a fund shares one inbox).
2. Mark a copy of the deck for each identifier and download the marked copies. Markedfile processes the file in memory and doesn't store its contents; the account keeps the identifier, file name and type, status and timestamps.
3. Send each person only their copy, through whatever channel you already use.
4. Keep the mapping private: identifier, person, date, which file. Don't put it in the deck or the email.
5. If a copy surfaces, upload it (or the screenshot you found) and run Detect. A match points to the copy that left your hands.
6. Treat a match as a lead. Check your records and talk to the person before drawing conclusions.

HowTo: mark a board deck for five board members

1. Export the deck as a PDF.
2. Create five identifiers, one per board member.
3. Mark the PDF once per identifier and download the five marked copies.
4. Send each member their own file.
5. If a copy appears outside the board, upload it to Detect and read the reported match and confidence.

What a match shows (and what it doesn't)

Markedfile reports confidence roughly as: about 99% for the exact file, 95% from the signed metadata mark alone, and about 81% for a re-saved file or a screenshot (visual pattern only). These are reported scores, not guaranteed detection, and never legal proof on their own.

Limits to plan for

• Forwarded PDF vs screenshot: a forwarded PDF is the strongest case. A screenshot of a slide is weaker and is best effort, not guaranteed. As an approximate minimum, a ticket needs around 200 pt, a slide around 320 pt, a photo around 160 pt, and a text page about the top half. Dense text on its own is often not detected.
• Older PDFs: the PDF mark is now invisible and older PDF marks aren't compatible, so re-mark decks you marked before the change.
• Images: roughly 256 px of a detailed area is the approximate minimum. Images and video frames under 96×96 px are rejected; everything else uses the same pattern.
• Page limits by plan: Free PDFs up to 10 pages, Starter up to 50, Pro up to 100, Business up to 500. Long board packs may need Pro or Business.
• Unmarked copies: anything sent before you started marking can't be traced later.

Detection is never 100%. Visible "CONFIDENTIAL" stamps still help set expectations, but they're easy to crop; see visible vs invisible watermarks.

Where Markedfile fits

Markedfile is self-serve forensic watermarking for images, PDFs and (on Business and Enterprise) video. Plans: Free (5 active files); Starter $9.99; Pro $19.99 (no active-file cap); Business $49.99 (shared workspace, video, API); Enterprise on a custom quote. If several people on your team send updates, Business adds the shared workspace. The API is on Business and Enterprise (docs) if you want to mark a copy per recipient automatically. Free, Starter, and Pro have no video and no API.

It was built because teams needed a way to mark files before sharing them (PDFs, photos, identity checks) and no self-serve tool did it. Board decks are the same problem with a short, high-stakes recipient list. There's also a short page on marking a board deck.

FAQ

Will investors notice the mark?
The PDF mark is invisible, so the deck looks the same. Some teams still mention in the update that copies are individually marked, which tends to discourage casual forwarding.

Do I need a separate copy for every update?
Yes, one marked copy per recipient per file. With a handful of board members that takes a few minutes; for larger lists the API on Business or Enterprise can automate it.

What if someone photographs the screen?
A photo of a screen is weaker than a digital screenshot, and the same size limits apply. Large, detailed slides work better than a cropped chart label.

Is a match enough to remove someone from the board?
That's a governance and legal decision, not a product claim. Use the match as a starting point, check your records, and get counsel if the stakes are high.

Next steps

Mark your next board deck for two recipients, take a screenshot of one slide from one copy, and run Detect to see how it behaves with your real slides. Plans are on pricing.