Don't put your software in the public domain

[Steven D'Aprano]

... because it is extremely unlikely to work. If you actually want your
users to be legally able to use your software without a commercial licence,
use a recognised open licence like the MIT licence. Public domain
dedications are on extremely shaky ground and give your users no
protection.

http://linuxmafia.com/faq/Licensing_and_Law/public-domain.html




-- 
Steven