@ luca: I'm agree with you.

If the reason for these proprietary softwares it to prevent copying of Maemo on other mobile device, then it's ineffective.

For each program that would proprietary in Maemo 5, there exist a FOSS alternative in FOSS Mobile or Desktop OS.

Example:

Conversation --> Empathy
Contact --> OpenMoko Contact
Media-Player_UI --> Canola
etc...

It will just adapt the UI, add 2 or 3 functionalitys and a similar API to API present in Maemo 5.

A Chinese company of copy that does not concern by quality can do this is shortly time.

But 100% closed is neither a solution. An example? The iPhone.
There are many Chinese copies of the iPhone.

If Maemo 5 begin popular, it will be copied.
If not popular, not copied.

So ultimately, this "anti-copy protection" will be ineffective and prevent the working of the community on certain elements of Maemo. That is all it will present.

So why these proprietary softwares?

I think it come more from the awkwardness than from the evilness.
But it will create problems to the community and ultimately to Nokia.