The phrase "authorized only by" is correct and usable in written English.
It can be used to specify that permission or approval is granted exclusively by a particular person or entity.
Example: "Access to the secure area is authorized only by the facility manager."
Alternatives: "permitted solely by" or "approved exclusively by".
Also, changes in thermostat temperature can be authorized only by maintenance supervisors.
Preauthorized electronic fund transfers from a consumer's account may be authorized only by a writing signed or similarly authenticated by the consumer.
This being the case, there is no reason to believe that presidents would be any more likely to exercise the line-item veto than they are to cancel projects authorized only by report language.
In case of being left at a dinner or party, it would have to have remote capabilities up the yin yang, authorized only by the President or majority of congress.
I therefore resolved on a bold stroke, and authorized only by the sentiments of the persons in question, [took action].
Capital punishment is authorized only by state law, but there is no objective statewide standard against which factors are weighed and a decision is made.
Unlike the police, these officers are authorized only to enforce city ordinances by imposing fines and other administrative penalties.
(The PPACA clearly and repeatedly provides that those subsidies and the attendant penalties are authorized only "through an Exchange established by the State"). The health care industry publication Modern Healthcare warns that a parade of horribles could follow a Halbig victory.
The Democratic National Committee has authorized only six.
When the group challenged that decision in court, a federal judge ruled that the city had not violated demonstrators' First Amendment rights by authorizing only a stationary rally on First Avenue.
The panel could authorize only some government bond purchases by the bailout fund, it said.
