[TazeTSchnitzel]

You could use it for DRM, yes, but that's not the sole use. The point is to put cryptographic keys and secret information somewhere out of direct reach of the CPU, to keep it more secure. An an example: Apple's iPhone stores all fingerprint data exclusively in its secure module.

[venomsnake]

Somebody other than the user to put it there. Because if user puts it there, he can read it too. Or is there something I don't understand?

[bryanlarsen]

No, it's write-only. You can ask "does this fingerprint match the one I stored earlier?", but you can't read out the original fingerprint.

[TazeTSchnitzel]

> Somebody other than the user to put it there.

No, the user can install software on the chip.

> Because if user puts it there, he can read it too.

Not all communications links are two-way.