Devices

Devices that TPM entitlements are popularly purchased on or against

Each manufacturer has specific rules for access to firmware, software and drivers for their devices and will make it hard for you as the end user to understand them. It really comes down to how you access the firmware, software and drivers, and the ways you are entitled to that access. Some manufacturers don't require a valid maintenance entitlement to get to the software and just allow access to it via download links. Others may require you to enter a serial number first to validate an entitlement to firmware, software and drivers.