John Morgridge, former president and CEO of Cisco and now chairman emeritus, on revelations that the NSA put spy bugs in Cisco products:I think our history would say that, you know, that we have certainly been through out our history taken a position not permitting unauthorised intrusion or use of our equipment. Now in a global world that's a hard thing to maintain because there is so much that is outside your control. And in spite of what we do and say and the resources that we put against it it's dynamic and you have to be forever vigilant in trying to maintain some basis.