Hi Andrew
Just a point on the text at Eventbrite: Raspberry Pi is not open source hardware. They've published the schematics as all rights reserved and without any licence specified, and for the PCB layout I've not seen anything other than a screen grab of the merged layers. The EDA CAD "source" files have not been provided either.
Thanks for the feedback, we'll re-word the description so it doesn't sound like we're calling the Raspberry Pi Open Source Hardware.
Mark