How do you protect PDF file from being browsed only in the app?

Hello everyone

I guess it's off topic question , but is there a way to protect a pdf file for example with password that can't be opened unless it's opened with my app inventor apk app ?

or it's better to convert the pages into pictures and load them there.

thank you

Files in assets or the private directory can only be read by the app, unless you have a rooted phone.

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do you mean I only change the files scope to private and files get protected for the unrooted phones but the rooted ones can get into them ?

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