dontrucast

I have Fences 4 throughout most of the office PCs in my facility. A lot of people have come and gone over the last couple of years. Some I've tried to "release" the key for fences associated with their email address, but it rarely works. Most of my existing keys are associated with old email addresses which is preventing me from reusing them with current email addresses. How can I "reset" these where they are no longer associated with an email address and can be reused