You keep referring to the four freedoms so I googled for them and found
http://www.gnu.org/philosophy/free-sw.html
So which of the freedoms did Tivo take away?
* The freedom to run the program, for any purpose (freedom 0).
* The freedom to study how the program works, and adapt it to
your needs (freedom 1). Access to the source code is a
precondition for this.
* The freedom to redistribute copies so you can help your neighbor
(freedom 2).
* The freedom to improve the program, and release your improvements
to the public, so that the whole community benefits (freedom 3).
Access to the source code is a precondition for this.
It doesn't seem to me they took away freedoms 1, 2 or 3. They released
the source to any free software components and we can study, modify,
redistribute, improve and release our improvements for the benefit of
the whole community.
btw. freedom 3 seems to be just repeating what we already got from
freedoms 1 and 2.
So the only one we could differ in opinion about is freedom 0. I would
say that they in no way are limiting my use of the Linux kernel (which
is the part I mostly care about) I can run the program for any purpose I
see fit. What if I want to run mythtv on my PC at home? Tivo has no
control whether or not I can do so even when my kernel contains any of
their modification or improvements, so I claim that I in fact retained
freedom 0.