InkDNA embeds low-visibility forensic watermarks into PDFs to trace leaks back to the original purchase, protecting ebooks and paid downloads without DRM.
Category
Security
Pricing
Three usage-based subscription tiers (Starter, Pro, Enterprise) differentiated by PDF size/page limits and monthly verification operations; exact dollar prices are not publicly disclosed and are shown at checkout, with Enterprise priced on request.
InkDNA is a forensic PDF watermarking service built for publishers, authors, and businesses that sell downloadable PDFs (ebooks, reports, guides) and want to deter and trace leaks without imposing DRM. Instead of locking files to a device or account, InkDNA embeds a low-visibility grid fingerprint into each PDF at the point of purchase, so the file itself remains a normal, unrestricted document. If a copy later leaks, the file can be checked against InkDNA's API: a "Detect" endpoint verifies a file against a known order ID in a single operation, while a "Submit" endpoint queues a lookup without an order ID using 1-3 operations depending on mode. Delivery is handled either through an official WooCommerce plugin (listed on WordPress.org) that automatically stamps downloads with the order number, or through a generic JavaScript loader script that can be embedded on any site with script access. InkDNA also offers a free, standalone Verify tool so anyone can check a suspect file locally. The company states it does not retain file content beyond processing and does not store personally identifying information.
Key Features
Forensic grid watermarking — Embeds a low-visibility grid fingerprint into each PDF at purchase time, without DRM or viewer lock-in, so leaked copies can be traced back to the original buyer.
Detect API — One-operation REST endpoint that verifies a suspect file against a known order ID.
Submit API — Queued lookup endpoint (1-3 operations) that identifies a file's source without requiring an order ID.
WooCommerce plugin — Official plugin listed on WordPress.org that automatically stamps PDF downloads with the customer order number.
Generic JS loader — A lightweight loader script (plugin.js) that can be embedded on any site allowing script injection, for platforms without a native plugin.
Free Verify tool — A standalone tool that lets anyone check a suspect PDF locally without an API key or account.
Pros & Cons
Pros
No DRM or viewer lock-in — customers get a normal, unrestricted PDF
Simple integration path via an official WooCommerce plugin or a generic JS loader for other platforms
Free, standalone Verify tool lets anyone check a suspect file without an account
Usage-based operation limits (1-3 ops per check) keep costs predictable and scalable by tier
Cons
Exact subscription pricing is not published — figures are only revealed at checkout or via sales for Enterprise
Official integrations are limited to WooCommerce and a generic script loader; no native Shopify, Zapify, or CMS-specific plugins are documented
No visible company/About page, making it hard to independently verify the team or company behind the product
Forensic watermarking only proves origin after a leak — it does not prevent redistribution up front