Look at ti like this. In ther eal world, you sign a contract on paper with ink, so does the other party. Same principle here, only digital. Now, later on, the other party types up a new contract and says "this is the new agreement". You break a rule which is in the 'new' agreement, and are penalised, even though you ahve only signed the old one. You go to court. The other party says 'but your honor, I changed the contract to this! I know, the new contrat was never signed... you mean, that's important?" Question- how many books will the judge throw at them? ;) Sounds ludicrous, right? Well, this is no more than the digital equivalent. Same rules.