Fix #865 - PDF metadata not encrypted (#867)

Co-authored-by: Lucas Cimon <925560+Lucas-C@users.noreply.github.com>

Author: lfavole

CHANGELOG.md

@@ -29,6 +29,7 @@ This can also be enabled programmatically with `warnings.simplefilter('default',
 - [`FPDF.image()`](https://pyfpdf.github.io/fpdf2/fpdf/fpdf.html#fpdf.fpdf.FPDF.image): allowing images path starting with `data` to be passed as input
 - text overflow is better handled by `FPDF.write()` & `FPDF.write_html()` - _cf._ [issue #847](https://github.com/PyFPDF/fpdf2/issues/847)
 - the initial text color is preserved when using `FPDF.write_html()` - _cf._ [issue #846](https://github.com/PyFPDF/fpdf2/issues/846)
+- PDF metadata not encrypted - _cf._ [issue #865](https://github.com/PyFPDF/fpdf2/issues/865)
 - handle superscript and subscript correctly when rendering `TextLine`- thanks to @Tolker-KU - _cf._ [Pull Request #862](https://github.com/PyFPDF/fpdf2/pull/862)
 ### Deprecated
 - the `center` optional parameter of [`FPDF.cell()`](https://pyfpdf.github.io/fpdf2/fpdf/fpdf.html#fpdf.fpdf.FPDF.cell) is **no more** deprecated, as it allows for horizontal positioning, which is different from text alignment control with `align="C"`

fpdf/output.py

@@ -90,12 +90,12 @@ def __init__(
         creation_date: PDFDate,
     ):
         super().__init__()
-        self.title = PDFString(title) if title else None
-        self.subject = PDFString(subject) if subject else None
-        self.author = PDFString(author) if author else None
-        self.keywords = PDFString(keywords) if keywords else None
-        self.creator = PDFString(creator) if creator else None
-        self.producer = PDFString(producer) if producer else None
+        self.title = PDFString(title, encrypt=True) if title else None
+        self.subject = PDFString(subject, encrypt=True) if subject else None
+        self.author = PDFString(author, encrypt=True) if author else None
+        self.keywords = PDFString(keywords, encrypt=True) if keywords else None
+        self.creator = PDFString(creator, encrypt=True) if creator else None
+        self.producer = PDFString(producer, encrypt=True) if producer else None
         self.creation_date = creation_date