Some people would be willing to donate some money to support the development of Kaspersky Free. Some people might donate small amounts like $1 or $5. $1 from a million users is $1 million.Could you add a donation button to Kaspersky Free? Maybe you could setup a Kaspersky Foundation and make the donation tax deductible. People might donate more if it lowers their taxes. Protecting users from cyber criminals is a charitable act.