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How to add captcha to pdf version

I want to add a captcha to the PDF generator from the Print Module so that my server doesn’t waste time generating a PDF for robots and to prevent DOS attacks.

There is a similar question asked, but the accepted answer doesn’t actually answer my question (the PDF Version part), but rather only the E-mail part.

Since the PDF Version doesn’t link to a form, there isn’t a form ID I can add to the Captcha module. Is there a way to require a CaPTCHA to download/generate a PDF?

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How to add captcha to pdf version

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