The obligation

Liability for Violation of Obligations
The basis for liability is the violation by the debtor of his obligation before the creditor.
Violation of obligation:
Failure to perform
Improper performance (performance not in time; performance with defects, violation of other conditions determined by the content of the obligation).
A debtor is brought to responsibility for the violation of an obligation at the demand of the creditor.

Forms of Liability
Compensation of Losses
Real Damage
Lost Profit
Forfeit (Penalty)
Confiscation of an Item
Loss of an Advance Payment

Methods of Securing the Execution of Obligations
The execution of an obligation may be secured with:
Forfeit
Pledge
Suretyship (warranty) and Guarantee
Advance payment

Forfeit
Forfeit (fine or penalty) is a monetary amount defined by the law or agreement,
which must be paid by a debtor to the creditor in the case of failure to fulfill, or of improper fulfillment of an obligation,
in particular, in the case of a delay in the fulfillment.
Upon the claim to pay the damages, the creditor is obliged to prove losses caused to him.

Pledge
Pledge is recognized as a method of securing the fulfillment of obligations, by which
a creditor (pledge holder) has the right, in the case of failure by the debtor to fulfill the obligation secured with the pledge,
to receive the satisfaction from the value of the pledged assets, in a priority procedure before the other creditors of the person to whom that property belongs (pledgor).

Types of Pledge
Mortgage is a type of pledge under which the pledged property remains in the possession and use of the pledgor or a third person.
Pawning is a type of pledge whereby the pledged property is transferred by the pledgor into the possession of the pledge holder.

Guarantee and Suretyship
By virtue of a guarantee the guarantor becomes liable to the creditor of another person (debtor) jointly in full or in part for the fulfillment of obligations of that person. (art. 329 of the Civil Code)
By virtue of a suretyship, the surety assumes the obligation before the creditor of any other person (debtor) to be liable subsidiary for the execution of that person's obligation in full or in part.
The guarantor and the surety who executed the obligation shall acquire all the rights of the creditor under that obligation in the amount in which the guarantor and the surety satisfied the claims of the creditor.

Advance Payment
A sum of money which is issued by one of the parties to an agreement, at the expense of the payments, which are due by it in accordance with the agreement, to the other party and in order to secure the conclusion and the execution of the agreement, is recognized as an advance payment.
When the failure to execute an obligation is the responsibility of a party which gave the advance payment, it remains with the other party, and if the party which received the advance payment is the guilty party, it is obliged to pay to the other party a double amount of the advance payment.
In terminating an obligation prior to the beginning of its execution, by agreement of the parties, or as a consequence of impossibility to execute it, which emerged without their guilt, the advance payment must be returned.