>Thanks for all the advise.  I am not planning to make any money off this
>project.  I just did it for fun in my spare time.  I think I'll just write
>to Dolby and ask how they would feel about it.  I cannot call my project
>Dolby Pro-Logic for the reason that the Dolby Pro-Logic name is owned by
>dolby and the software I wrote does not meet the entire spec.  I don't
>have the time or money for lawyers, so I might have to blow off the whole
>deal if Dolby even whinces.
>

It seems that what you did was for educational purposes. A patent cannot be
used to prevent "exploration" of an area of knowledge. If you attempt to
commercialize your exploration then you have a problem. Publishing a
schematic or code of a product is OK as well as long as you don't copy it
exactly or in toto and clearly reference the source of your information. If
you wish to excerpt portions of the patent itself for discussion in
educational forums that is ok as well. Don't publish a schematic or code as
is though as then you would be violating a copyright.

PS: I am not a lawyer, my opinions are not to be construed as legal advice.