Undertakings may not accumulate radio frequencies in order to distort competition in the market. Such conduct on the part of an undertaking may be detected in particular when it fails to use radio frequencies to the extent and by the deadlines laid down in the decision itself or in the undertaking’s tender and there are no objective reasons which the undertaking was unable to influence or foresee at the time the decision was allocated, or when it follows from its conduct that the undertaking acquired the radio frequency in order to restrict competition in the market. Article 57 (amendment of a decision allocating radio frequencies) (1) The Agency may amend a decision allocating radio frequencies ex officio or at the proposal of the beneficiary of the decision. (2) A decision allocating radio frequencies shall be amended ex officio if: 1. the distribution of radio frequency bands or use of radio frequencies changes; 2. public demand arises that cannot be met in any other way; 3. it is required for efficient use of the radio frequency spectrum for the public benefit; 4. harmful interference cannot otherwise be avoided or radio frequency protection is not achieved; 5. it is so required by acts of international law applicable in the Republic of Slovenia and relating to radio frequencies; 6. the name of the beneficiary of the decision allocating radio frequencies or the name of the programme changes; 7. it is required in order to form beneficiaries of decisions allocating radio frequencies into wider regional or national radio or television programming networks registered with the competent body under the act governing the media; 8. it is required in order to implement EU regulations in the field of electronic communications. (3) The amendment of a decision allocating radio frequencies at the proposal of its beneficiary shall be possible only within the area of coverage of the decision and only if it does not encroach upon the rights of others and if the conditions under this Act are met. In the case of amendment of a decision allocating radio frequencies for the provision of broadcasting, amendment shall be possible outside the area of coverage if such an amendment ensures greater efficiency of use of radio frequencies, does not substantially alter the area of coverage, and does not encroach on the benefits enjoyed by other beneficiaries of decisions allocating radio frequencies, if the conditions under this Act are met. (4) A decision allocating radio frequencies may not be amended at the proposal of its beneficiary if proceedings to abrogate the decision under point 3 of the fourth paragraph of Article 58 of this Act are being conducted against the beneficiary of the right to use radio frequencies. (5) The Agency shall, when amending a decision allocating radio frequencies, issue a new decision allocating radio frequencies and annul the previous decision. The Agency may also determine the extent of and deadline for adjustment in the new decision. In the cases referred to in the second paragraph of this Article, the Agency may also annul a decision allocating radio frequencies in its entirety with a new decision and determine new content for that decision. (6) In the decision referred to in the preceding paragraph, the Agency may, in exceptional cases, extend the validity of the decision allocating radio frequencies, but not a decision allocating radio frequencies for the provision of public communications services to end-users,