[CentOS] About license at redistribution

 Hello.

I'd like to ask about license issue.
Now I'm planning to make and sell some measurement system controlled by PC.
There is no technical issue but I don't have enough information about
license.

I will do the following,

 1) Install CentOS and my applications on the PC.
 2) Sell the PC as a measurement device.
 3) Distribute DVD made from CentOS iso image file to the user if he/she
needs.

 Question 1.
 Is there no problem from the view point of CentOS license ?

 Question 2.
 Should I donate to CentOS community ?


Best Regards.