How to save, create or make a PDF read only or non editable

Why creating read only PDF files using PDF password protection is pointless.  Loads of apps and online solutions claim to make a PDF uneditable, but what they don’t tell you is how simple it is to remove the read-only restrictions.  Here we cover two of the most popular solutions, why they provide zero protection against modification, and how to make a PDF document read only permanently to prevent editing, copying & printing.
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