TIP: In almost all cases of creative work (z.B. a logo you pay for designing it), copyright remains the responsibility of the author, whether or not it was created on your behalf. If you use a contractor to manufacture copyrighted material, make sure that the contract involves the transfer of these protections, so that you own all the rights to the materials you paid for. In the United States, an unusual type of unworkable contract is a personal employment contract to work as a spy or secret agent. Indeed, the secret of the contract is a condition of the contract (to maintain plausible denial). If the spy then sues the government for issues such as salary or benefits, the spy violated the contract by revealing its existence. It is therefore unenforceable for this reason, as is the public policy of maintaining national security (because an angry officer might try to reveal all the secrets of the government during his complaint).  Other types of non-opposable employment contracts include contracts that agree to work for less than the minimum wage and lose the right to workers` compensation in cases where compensation is due. Contract law does not set a clear limit on what is considered an acceptable false claim or unacceptable. The question, then, is what types of false allegations (or deceptions) will be significant enough to invalidate a contract on the basis of this deception.
Advertising that uses “puffing” or the practice of exaggerating certain things is a matter of possible false assertions.  The parties should endeavour to clarify the conditions during the design phase. However, if flexibility is required or if it is not possible to stop a significant clause at the time of the contract, the parties may observe that it is void, as the contract has no legal effect. This does not mean that policyholders would necessarily be prevented from recouping premiums paid for insurance coverage. Recently, it was recognized that there was a third category, restitution obligations, based on the defendant`s undue enrichment at the plaintiff`s expense. Contractual liability, which reflects the constitutive function of the contract, is generally for failure to do things better (by unsurented benefit), liability in the unlawful act is generally aggravated for measures (as opposed to omission) things, and liability in restitution is for the unjustified taking or maintenance of the benefits of the plaintiff`s money or work.  In many countries, the aggrieved victim may bring a civil (non-penal) action in court to obtain damages for breach or to obtain a defined benefit or other appropriate discharge.  The type of illegality (see above) that makes a treaty illegal may occur: after an offence, the innocent party has a duty to reduce losses through appropriate measures.