IANAL, but I assume that if someone actually memorized a confidential document, rewrote it from memory, and showed it to people at another company, it would be

IANAL, but I assume that if someone actually memorized a confidential document, rewrote it from memory, and showed it to people at another company, it would be equivalent to just walking out the door with the physical document in the eyes of the law. judges tend not to be amused by these kinds of logical gymnastics.