@Azuza - Crime insurance is indeed a wonderful thing. If your friends with businesses don't have it they need to get it immediately. I would also advise them to make sure they get intellectual property coverage as part of their small business insurance package.
In the long run theft of intellectual property can cost a company much more than loss of physical property. As the article says intellectual property coverage is usually available as an additional coverage. It's usually priced pretty reasonably and a very good thing to have.