Remaining vacation days should cover the better part of one month alone. If you don't want them to come in for whatever reason, you can send them on paid leave.

Remaining vacation days should cover the better part of one month alone. If you don't want them to come in for whatever reason, you can send them on paid leave. Most companies stop having "legitimate security reasons" when the alternative is to pay people for doing nothing. Turns out the fact that actual sabotage and theft of trade secrets is illegal (and often represents a breach of the employment contract, which can incur hefty fines) is a sufficient deterrent for most industries.