license questions about Elgg

Hi,

 

I have been looking at using elgg and registered and installed onto my site.  However I wanted to clarify a few things first before choosing to use elgg.

 

1.       If the site made money and was sold does elgg hold anything against me doing this?

2.       Can I remove the powerd by elgg?

3.       Does all people who register on my site automatically register on elgg.org and the black toolbar at the top have to remain there?

 

Thank you for your help.