The phrase "are mostly secured" is correct and usable in written English.
It can be used to describe a situation where something is generally safe or protected, but not entirely so.
Example: "The funds for the project are mostly secured, but we still need to find additional sponsors."
Alternatives: "are largely guaranteed" or "are primarily protected".
Note that those who are winning from the current policy are mostly securing those wins at the expense of some unidentified losers.
The east side of Mosul, a city of 1.8 million that is Iraq's second largest, was mostly secured by Iraqi forces in January.
Our current voluntary, do it yourself, individual commercial accounts do NOT work for most people, though the well-off are mostly secure having generous wealth to rely on.
But musical fundamentals were mostly secure, including stylish accompaniment from four members of Siren Baroque on a tiny stage behind the singers.
At the same time, though Pakistani troops encountered more fighters trying to slip into Pakistan this week, the officials said that the border was mostly secure and that they did not believe that the forces now battling American troops in eastern Afghanistan had re-entered Afghanistan from Pakistan.
For now Snowden appears to be mostly secure.
Several unsuccessful rebellions followed, but by 1075 William's hold on England was mostly secure, allowing him to spend the majority of the rest of his reign on the continent.
They are mostly on heavily secured bases, not on the battlefield.
Unlike Boko Haram, however, these militants are mostly focused on securing autonomy for the delta, not on imposing a radical religious ideology.
The Indian government's aggressive timetable for rolling out the cash transfer program has led some of its political opponents to claim that the entire exercise is mostly about securing political support for the governing coalition led by the Indian National Congress Party.
