Developing Commercial Applications in Python

[eeykay at gmail.com]

Hello All,
I am trying to convince my client to use Python in his new product. He
is worried about the license issues. Can somebody there to point me any
good commercial applications developed using python ?. The licence
clearly says Python can be used for commercial applications. Is there
any other implications like that of GPL to make the source open ?
Thanks for any help.
eeykay