Your licence
Stratdeck Pro is tied to your Steam account and can be active on up to 5 devices at once. This page shows which ones, and lets you free a slot.
Sign in with Steam to see your devices. The sign-in happens on Steam's own page — Stratdeck never sees your password, and asks for nothing but your SteamID.
Removing a device frees its slot immediately. The device itself keeps working until it next checks in, and can be added again at any time — nothing is lost, and your saved files are yours regardless.
Devices that have not checked in for 60 days give up their slot automatically, so a dead laptop never blocks you.
Your SteamID64, one identifier per device, the name that device reported, and the times it was added and last seen. No password, no email, no IP-based locking. Nothing here is used for anything but counting devices against your licence.