A signed licence on your computer
After activation, your licence is stored on the computer as a signed record that Lambda PDF Basic verifies. It cannot be edited, and a copy does not work on another computer.
Account and licensing
A licence you own, on computers you control.
Accounts and licensing open at launch. This page explains how they are designed to work, so you know exactly what owning Lambda PDF Basic means before purchasing opens.
01
Account
One Eigenexis account holds your licence
Your Lambda PDF Basic licence and your list of activated computers live on one Eigenexis account. Sign-in is planned to use passkeys, so there is no password to remember or leak.
Accounts, checkout, and licensing run on dedicated services, separate from this cookieless website. Your documents are never connected to your account.
02
Ownership
A perpetual licence, with clear update terms
- Perpetual licence
- Perpetual licence: pay once and keep using the version you buy. No subscription.
- Updates
- Keep using the version you buy for as long as you like. Updates within the same major version (for example, every 1.x release) are included; a later major version is a separate upgrade.
- Reinstalling
- Versions covered by your licence stay available, so you can reinstall at any time.
03
Activation
Online activation, offline work
Activation is online, and the licence is then stored securely on your computer. Connect at least once every 14 days to keep editing features active; documents always remain viewable, printable, and savable.
Connect every 14 days
Editing features stay active while the computer connects at least once every 14 days. Lambda PDF Basic refreshes quietly whenever it is online.
Documents always stay yours
Available without any licence or activation so documents always remain viewable, searchable, printable, and savable without loss.
If the licensing service is ever unavailable
Eigenexis Systems can publish a signed continuity grant that keeps existing activations working during an extended outage.
04
Computers
Use it on your computers
One licence activates on up to 2 computers. You will see your computers in your account and can deactivate one to move the licence. Reactivating the same computer replaces its earlier activation instead of using a new one.
05
Licensing data
What licensing sends, and nothing more
Licensing needs a small, fixed set of device information to activate and refresh a licence. It never includes document information.
- A random device identifier
- The device's public key (the private key never leaves the device)
- A hashed hardware identifier
- The computer name you see in your account
- The application version
06
Questions
Questions about accounts and licensing
Editing features pause until Lambda PDF Basic can refresh its licence. Viewing, printing, searching, and saving keep working, so your documents are never locked away.
No. Your licence is perpetual. You keep using the version you have, and updates within that version stay included; a later major version is a separate upgrade.
Deactivate the old computer from your account or from the application, then activate the new one. One licence allows up to 2 activated computers at a time.
Yes, to buy and activate. The account holds your licence and your list of activated computers. Sign-in is planned to use passkeys, and your documents are never connected to it.
Buy it once. Keep using it.
Lambda PDF Basic is sold once, as a perpetual licence on your Eigenexis account.
See pricing