What do you mean by editing PDF? If you have a PDF form and want to make some form fields, in your case pages other than the first page, non-editable, you can lock the form fields on all pages other than first. You can write a JavaScript that does that, include it in the original PDF form and activate it at some point in time (like when a certain button is clicked, or certain form field gets focus). If you mean other ways of editing, like changing text on a page, you cannot protect only part of the document from that.
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