I can confirm, it's responsibly sourced cork from sustainably managed forests, and only sliced from the cork trees that have died naturally and fallen to the forest floor.
I am sticking to my principles - and the same principles that lead me to support the Raspberry Pi foundation's work, and the Linux operating system on which it operates also lead me to allow the Corkboard solution to be used freely and without restriction by the people of the global village.
An interesting idea. You could always build your house around the living cork tree, and then the shelter would be less of an issue. The concept deserves some further consideration.