It really depends on the work environment. Sometimes you work with people and it's fine, other times it isn't. I have been permanantly banned from ever stepping foot on the premises of my old workplace due to their fears that I'd do something bad to them.

I never did anything while I was there and don't really care to....they're just scared of it. One of my old bosses here said he'd be reluctant to hire me back here if they ever got rid of me due to my skillset for pretty much the same reason.

When it comes to pirating and warez most respectable companies will can your ass nowadays. They don't want the legal liability. Many companies treat unauthorized auditing of their systems and applications the same way.