PDF sent with Watermark

Hi,

We used this plug-in on a project. It works perfectly but the PDF is sent with a watermark. We are wondering which upgrade should we get in order to get rid of it so we can have a clean pdf.

So far I found this one
https://maximum.software/store/pdf-ninja-api-pro/?v=0b98720dcb2c
and this one
https://webheadcoder.com/contact-form-7-multi-step-forms/#pro

but I wonder if the second one could get rid of it and if not which one should we use.

Thanks ahead!!