1.) This is just a particular method to detect tampering. It's pretty clever in a lot of ways. As mentioned elsewhere, try reading the article. 2.) The present

1.) This is just a particular method to detect tampering. It's pretty clever in a lot of ways. As mentioned elsewhere, try reading the article. 2.) The presenters specifically mention that this isn't the "be all/end all" of detecting tampering and the sort of people who would believe that probably have no interest in watching this presentation. Relax.