The phenomenon of re-contextualization, consisting in resituating a cultural object in a new media context, is typical of the digital media. It is probably more common than reproduction. To better understand the phenomenon, the author analyses a case of repurposing of television archives and, more specifically, the editorialization of images of 9/11 by the Internet Archive foundation. This example allows him to identify two forms of re-contextualization: time re-contextualization and medium re-contextualization. Then, at the interface of two different sets of studies - historiography (how to make sense of a document from the past in the present) and media studies (how a document is formatted by a digital medium) - he adopts a crosscutting semiotic approach to carry out a comprehensive analysis.