Can I redistribute Palm's sample code (with my modification)?

[Horace Ho]

I am wondering to what extend we can use the Palm sample
source code in the SDK. I am going to start an app which
uses a lot of the sample code, say 90% of the whole app.
And I want to distribute the app with source code. 

Since there are copyright notice inside the sample code, 
I do not know if it's ok for me to distribute the codes
(90% from the sample, 10% my addition).

Could anyone provide more information? Why didn't 3COM
just remove any copyright notice from sample codes?

Thanks
horace