Just read today that an Iranian contractor downloaded software on how to run a nuclear plant and gave it to Iran:
"The allegations center on former Palo Verde engineer Mohammad Alavi, 49, who is accused in a recently unsealed federal affidavit of traveling to Tehran last year and downloading, from a Maryland-based Palo Verde vendor, software that contained details of the plant. Those included information about control rooms, reactors and design. The software was used to simulate situations for training."
http://www.azcentral.com/arizonarepublic/news/articles/0422nuclear-reax0422.html