Sale of books by LKY

Dear Mr. Tan,
When we work for a company, whatever we create on company time is property of company.
LKY was speaking as MM and doing the interview with the reporters in his office / government premises. so the content should property of government and therefore public property.
Now, LKY is selling his book and making profit from it?
Is this ethical?
SV

REPLY
I recall that, in the past, the proceeds from the sale of books by LKY are donated to charity.