How can I make web scraping of a field more difficult?
You can try to do something like this:

&lt;div class="hidden-text"&gt;
&lt;span class="text-change"&gt;Your Placeholder&lt;/span&gt;
&lt;/div&gt;

&lt;script&gt;
jQuery.noConflict();
(function ($) {
$(function(){
$(".hidden-text").click(function () {
    ($(".text-change").text() === "Your Placeholder") ? $(".text-change").text("&lt;?php print render ($content['field'][0]['#markup']);?&gt;") : $(".text-change").text("Your Placeholder");
});
});
})(jQuery);
&lt;/script&gt;