On May 13, 2011, at 1:01 PM, Kris Tilford wrote:

> On May 13, 2011, at 9:29 AM, Bruce Johnson wrote:
> 
>> If you believe that EFI is some great conspiracy to prevent you from running 
>> another OS on a Mac it is YOU who doesn't understand what EFI is.
> 
> I believe he's referring to TPM, not EFI. My understanding of TPM is that 
> it's a set of cryptographic keys that prevents software from running on any 
> "untrusted" system (meaning, "unapproved" hardware).
> 
> If Apple controls the "keys", then the argument is that Apple "owns" the 
> computer they "sold" you. In labor relations, there's something known as a 
> "lock out", which the NFL is on the cusp of having now. I know it's highly 
> unlikely, but from a theoretical standpoint Apple could "lockout" the owners 
> of Intel Macs. PPC Macs would still be playing ball because our playing field 
> has no locks or keys.

Well, no, because that's not how TPM works.

<http://osxbook.com/book/bonus/chapter7/tpmdrmmyth/>

This includes the instructions and source code for a TPM-enabled Application 
with user-specified keys.


-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs


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