Systems and methods that can detect known undesired computer files in protected archives are provided. According to one embodiment, an archive file in transit across a network as an attachment to an email message destined for a client workstation is scanned, without decrypting or decompressing contents...http://www.google.fr/patents/US8151355?utm_source=gb-gplus-shareBrevet US8151355 - Detection of undesired computer files in archives