How to plant an employer and (question to all) how not to let yourself be planted?

Our “competent” legislators, under pressure from commodity companies seeking to the WTO, have passed new laws relating to copyright, etc.

Imagine this scenario:

1. The company decides to dismiss a careless employee.
2. The careless employee decides to spite the firm.
3. He writes on a computer, server, etc. all sorts of different pirated MP3s, and installing unlicensed programs on a working machine.
4. This is followed by the knock of "disinterested" and "competent" employees of a thread of control-Ka.
5. They gladly come and fulfill the plan for disclosure.
6. The general director receives 6 years or his opera is promoted for serious loot.

Is such a scenario real?

Question to all, especially to local lawyers: and how to defend?
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One of the ways to protect me seems to be the transition to the OS, which allows to actually control access rights, distribute quotas and track changes on the hard disk. For example, Linux.

Of course, protection against such threats must be multi-level, ranging from controlling access to the office. Update: starting with a set of adequate staff.