William Gibson’s poem played from a 3½-inch diskette on a 1992-era Mac computer running the System 7 operating system. When the diskette ran, the text of the poem scrolled up the screen (accompanied by infrequent sound effects: a camera shutter click, a gun going off) while an encryption program on the diskette encoded each line and made the poem “disappear” after its first reading. On December 9, 2008—the sixteenth anniversary of the original “Transmission” event debuting Agrippa—The Agrippa Files was aided by the Maryland Institute for Technology in the Humanities and the Digital Forensics Lab at University of Maryland, College Park, ...