Vulnerability assessment - get permission first

Before assessing systems that are not 100% your own (ownership, accountability, etc) you should get permission to do vulnerability scanning. At least is you are an ethical hacker. While doing research I stumbled across this permission memo, courtesy of Ed Skoudis, I highly recommend that readers use this, or some other means, to get permission before starting any assessments on computers that you do not own. Even your employer's computers.

http://www.counterhack.net/permission_memo.html