encryption - How to support password protection to a document similar to keynote in iOS -


is there apple api support encryption of document similar keynote application(.key file) or in general how support encryption entire document.

i can't encrypt entire folder because in icloud scenario small change trigger entire document upload looks missing something.

i tried see how files encrypted in keynote. in below image left side document without password , other 1 password.

enter image description here

thanks

i think there no straight forward way encrypt entire document have file file.


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