Richard Stallman writes:

> I am interested in understanding what that means.  Could you describe
> in 10-20 lines what it means?  What is the input, what is the output,
> and what software does the conversion?

I think I can write a simple demo to help you understand. ;) Please wait.
-- 
Retrieve my PGP public key:

  gpg --recv-keys D47A9C8B2AE3905B563D9135BE42B352A9F6821F

Zihao