Pypdf

Security (SEC)
- Warn about PDF encryption security (1755)

Robustness (ROB)
- Prevent loop in Cloning (1770)
- Capture UnicodeDecodeError at PdfReader.pdf_header (1768)

Documentation (DOC)
- Add .readthedocs.yaml and bump docs dependencies using `tox -e deps` (1750, 1752)

Developer Experience (DEV)
- Make make_changelog.py idempotent

Maintenance (MAINT)
- Move generation of file identifiers to a method (1760)

Testing (TST)
- Add xmp test (1775)

[Full Changelog](https://github.com/py-pdf/pypdf/compare/3.7.0...3.7.1)

Security (SEC)
- Use Python's secrets module instead of random module (1748)

New Features (ENH)
- Add AnnotationBuilder.highlight text markup annotation (1740)
- Add AnnotationBuilder.popup (1665)
- Add AnnotationBuilder.polyline annotation support (1726)
- Add clone_from parameter in PdfWriter constructor (1703)

Bug Fixes (BUG)
- 'DictionaryObject' object has no attribute 'indirect_reference' (1729)

Robustness (ROB)
- Handle params NullObject in decode_stream_data (1738)

Documentation (DOC)
- Project scope (1743)

Maintenance (MAINT)
- Add AnnotationFlag (1746)
- Add LazyDict.__str__ (1727)


[Full Changelog](https://github.com/py-pdf/pypdf/compare/3.6.0...3.7.0)

New Features (ENH)
- Extend PdfWriter.append() to PageObjects (1704)
- Support qualified names in update_page_form_field_values (1695)

Robustness (ROB)
- Tolerate streams without length field (1717)
- Accept DictionaryObject in /D of NamedDestination (1720)
- Widths def in cmap calls IndirectObject (1719)

[Full Changelog](https://github.com/py-pdf/pypdf/compare/3.5.2...3.6.0)

⚠️ We discovered that compress_content_stream has to be applied to a page of
the PdfWriter. It may not be applied to a page of the PdfReader!

Bug Fixes (BUG)
- compress_content_stream not readable in Adobe Acrobat (1698)
- Pass logging parameters correctly in set_need_appearances_writer (1697)
- Write /Root/AcroForm in set_need_appearances_writer (1639)

Robustness (ROB)
- Allow more whitespaces within linearized file (1701)

[Full Changelog](https://github.com/py-pdf/pypdf/compare/3.5.1...3.5.2)

Robustness (ROB)
- Some attributes not copied in DictionaryObject._clone (1635)
- Allow merging multiple time pages with annots (1624)

Testing (TST)
- Replace pytest.mark.external by enable_socket (1657)

[Full Changelog](https://github.com/py-pdf/pypdf/compare/3.5.0...3.5.1)

New Features (ENH)
- Add reader.attachments public interface (1611, 1661)
- Add PdfWriter.remove_objects_from_page(page: PageObject, to_delete: ObjectDeletionFlag) (1648)
- Allow free-text annotation to have transparent border/background (1664)

Bug Fixes (BUG)
- Allow decryption with empty password for AlgV5 (1663)
- Let PdfWriter.pages return PageObject after calling `clone_document_from_reader()` (1613)
- Invalid font pointed during merge_resources (1641)

Robustness (ROB)
- Cope with invalid objects in IndirectObject.clone (1637)
- Improve tolerance to invalid Names/Dests (1658)
- Decode encoded values in get_fields (1636)
- Let PdfWriter.merge cope with missing "/Fields" (1628)

[Full Changelog](https://github.com/py-pdf/pypdf/compare/3.4.1...3.5.0)