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Discover LudwigThe phrase "keep secure" is correct and can be used in written English.
It means to make sure that something is safe and protected from harm or danger. Example: Please remember to keep the documents secure until the meeting tomorrow. In this sentence, "keep secure" is used to remind someone to make sure the documents are kept safe and not accessed by anyone until the meeting.
Exact(22)
Many companies also have encrypted data that they need to keep secure.
"The logistics are complex and difficult to keep secure," he said in urging Israel to abolish the program.
During the so-called crypto wars that raged for most of the 1990s, the government wanted to keep secure encryption technologies all to itself, arguing that their widespread use would empower drug traffickers and terrorists.
An open door doesn't make a business necessarily unsafe, for example; but a business with 20 open doors is likely to be much harder to keep secure than a business with just one.
Going even one step further, to enable two lines to deal with each other's e-tickets, is slow because electronic passenger data are proprietary information that a line must keep secure.
Acts of terrorism like this are prime examples of how difficult it is to keep secure such a vast territory – with its incredible ethnic diversity, lack of cohesive society, and major problems with infrastructure.
Similar(38)
All documentation is kept secure and destroyed securely after processing.
This file must be kept secure.
How will it be kept secure?
Yes, any information we obtain from you is kept secure.
How is the international reference kilogram kept secure?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com