I would like to know what is the feature or software in Acrobat which allows to indicate a licence with the name of the person who purchase the document and the utilisation conditions in the bottom of each page of the document ?
There is no such feature in Acrobat. You can add a security policy that will ask for a password when the file is opened or edited, and you can add a watermark with someone's name in it, but that's about it. What you're describing was probably created using some third-party software, probably some kind of DRM technology.
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