Double don't do this

From the Apple e-book opinion:

Hachette’s Young told Nourry in late Fall 2009, “[c]ompletely confidentially, Carolyn [Reidy] has told me that they [Simon & Schuster] are delaying the new Stephen King, with his full support, but will not be announcing this until after Labor Day.” Understanding the impropriety of this exchange of confidential information with a competitor, Young advised Nourry that “it would be prudent for you to double delete this from your email files when you return to your office.”

Antitrust law is far from healthy, but some conduct still counts.