Do you mean someone is offering to sell you a disc that was bundled with their camera?
I doubt LR, itself, is crippled, but there could be some restriction for licensing or some hoops to jump through to get the serial number, which might only work if you have the camera’s sales receipt or know other details about the purchase.
There may also be fine print that says only the person who purchased the camera can use the LR serial number. I don’t know how Adobe would enforce that restriction, but maybe they have some way, especially if this LR version is for a camera purchase in a different country.