The pdf_set_info() function sets an information field of a pdf document. Possible values for the fieldname are 'Subject', 'Title', 'Creator', 'Author', 'Keywords' and one user-defined name. It can be called before beginning a page.
Note: This function replaces pdf_set_info_keywords(), pdf_set_info_title(), pdf_set_info_subject(), pdf_set_info_creator(), pdf_set_info_sybject().