Device-Lock, Explained: What It Actually Stops (And What It Doesn't)

Someone sends a customer a quote. The customer forwards it to a friend "who knows about cars," or texts it to their spouse, or -- less innocently -- passes it along to a completely different business as a number to beat. With a normal link, all of that just works. The link doesn't know or care who's opening it.

Device-lock changes that in one specific, useful way: the first device to open the link is the only device that can. Forward it to someone else, and it simply won't open for them.

The exact scenario this solves

This isn't about stopping determined, technical bad actors -- nothing on the web can fully do that, and we're not going to pretend otherwise. What it does solve is the extremely common, mostly-innocent case: a customer forwards a link without thinking twice about it, because that's just what people do with links. Device-lock means that casual, thoughtless forward doesn't quietly hand your pricing to whoever it lands with.

How it actually works, in plain terms

The first time a link is opened, that device gets recognized and remembered. Every time after that, the system checks: is this the same device that opened it originally? If yes, everything works normally. If no -- a different phone, a different laptop, someone else entirely -- they see a clear message that the link is locked to the original device, instead of the document just opening for them.

What it doesn't claim to do

We think it's worth being direct about the limits here, the same way we are about screenshots. A sufficiently technical person could, in theory, find a way around device recognition. This isn't a cryptographic guarantee against a determined attacker with real technical skill. It's a practical, real barrier against the ordinary, everyday version of this problem -- which, for almost every business sending quotes and contracts, is the version that actually costs them deals.

Why this is worth turning on

If you're sending anything with real pricing leverage attached to it -- a financing offer, an out-the-door number, a time-sensitive discount -- device-lock is one of the simplest ways to make sure that number stays between you and the person it was actually meant for.