The phrase "authorised decree" is correct and usable in written English.
It can be used in contexts where an official or formal order has been issued by a person or body with the authority to do so.
Example: "The government issued an authorised decree to implement new regulations for public safety."
Alternatives: "official order" or "sanctioned directive".
The Sultan's decree authorised Rassam to "pack and dispatch to England any antiquities [he] found … provided, however, there were no duplicates".
Privateers were sea captains who carried Letters of Marque, signed by royal decree, which authorised them to harass His Majesty's enemies abroad – a kind of 17th-century licence to kill.
But at the last minute, a court put the listing off again, to consider activists' charge that the decree authorising the sale violates the constitution.
On 9 December, President Morsi issued a decree authorising the armed forces to protect national institutions and polling places.
Amid increasing unrest, President Morsi issued a decree authorising the armed forces to protect national institutions and polling places until a referendum on the draft constitution was held on 15 December 2012.
As opposition mounted, President Morsi issued a decree authorising the armed forces to protect national institutions and polling places until a referendum on the draft constitution was held in December 2012, which critics said amounted to a form of martial law.
With knowledge of Himmler's methods, Frick signed decrees authorising him to take necessary security measures in certain of the Incorporated Territories.
Since his election last May, he has overruled several of Mr Ecevit's decrees, including one that would have authorised his government to sack hundreds of civil servants deemed to be over-pious (ie, with Islamist political leanings) or over-sympathetic to the country's 12m or so Kurds.
Prince Amedeo, 29, will give up his place in the order of succession because he did not ask for a royal decree to authorise his marriage to an Italian aristocrat in July last year.
On Tuesday, a supreme court justice authorised another investigation for corruption and money laundering after the president issued a decree over ports that allegedly benefited a ports company.
