Watch and learn hackers -- mess with Madonna and you'll pay a hefty price ... more than a year behind bars.
Adi Lederman, a 38-year-old guy from Tel Aviv, copped to hacking Madge's computer and selling some of her unreleased songs online -- and on Thursday, he was sentenced to 14 months in prison.
In his plea, Lederman admitted to computer trespassing, invasion of privacy and copying copyrighted works in order to sell them.
Lederman did get off easy -- he was initially charged with a few more crimes ... including illegal wiretapping, invasion of privacy, copyright violations and obstruction of justice.
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