Therefore, a contract is generally not concluded if the contract is signed prior to the commissioning of the product and both parties have had the opportunity to verify its contents and conditions. However, licensing agreements with standard conditions (SPC) have become a standard practice in the software products industry. They require that the offer be accepted at the same time when the software product is used for the first time (different wrap licenses). Given the general principles of the treaty, it is not certain that such a procedure constitutes the conclusion of a binding contract. However, in practice, these contracts are considered to be binding in the business field. In certain circumstances, an unspoken contract may be established. A contract is implied when the circumstances imply that the parties have entered into an agreement when they have not expressly done so. For example, John Smith, a former lawyer, can implicitly enter into a contract by going to a doctor and being examined; If the patient refuses to pay after the examination, the patient has broken an implied contract. A contract implied by law is also called quasi-contract because it is not actually a contract; Rather, it is a means for the courts to remedy situations in which one party would be unfairly enriched if it were not obliged to compensate the other. The Quanten Meruit claims are an example.
Second, the party who drafted the CCS is required to draw the licensee`s attention to unusual or strict conditions. In particular, the principle of unusual and strict conditions is intended to protect parties who do not wish to become familiar with the CPS. A condition that may be considered unusual and strict is not part of the contract, unless the party who drafted it draws the other party`s attention to the existence and content of the condition. An example of an unusual and strict condition in a software license agreement could be that that gives the licensee the right to update the licensee`s software so that it is impossible to copy and use certain files. Such a condition was used z.B in Microsoft Windows XP Professional`s end-user license agreement of 18.08.01. Not all agreements are necessarily contractual, as the parties are generally considered to be legally bound. A “gentlemen`s agreement” should not be legally applicable and “compulsory only in honour.”    On the other hand, budgetary and social agreements such as those between children and parents are generally unenforceable on the basis of public order. For example, in the English case Balfour v. Balfour, a man agreed to give 30 dollars a month to his wife while he was not home, but the court refused to enforce the agreement when the husband stopped paying. On the other hand, in Merritt/Merritt, the Tribunal imposed an agreement between an insane couple, because the circumstances suggested that their agreement should have legal consequences.
An exception arises when advertising makes a unilateral promise, such as offering a reward, as decided in the famous case of Carlill v Carbolic Smoke Ball Co, in 19th century England.