Negotiate a contract One of the important principals in our contractual relations with legal persons (physical and/or moral person) is the freedom of our voluntary; means that everyone has a total liberty to make a contract or not, and to negotiate the clauses of the offer and the acceptance. According to the legal meaning of "contract", any relation between two legal persons is a contract, when someone asks a taxi driver to bring him/her to a place is a transport contract, when we buy a cigarette is a sell contract... and so on. Contracts are getting complicated today, and they are not based on the freedom of voluntary any more, people are often forced to make different kind of compulsory contracts : Insurance, transport, electricity, communications... etc. And they are forced to contract with determined legal persons under specific clauses without having any right to negotiate anything. Companies of electronic services are more requiring this kind of contracting ways, where we have to adhere to the contract not to accept it, and without negotiate anything.