This package incorporates code adapted from:

  nextgen_pdf_editor
  Copyright (c) 2025 Asint.net
  https://github.com/StillSomehowSane/nextgen_pdf_editor
  Licensed under the BSD 3-Clause License.

Specifically, the drawing, highlight, underline, text-box, image, and
save-pdf controllers under lib/src/controllers/, and the color picker and
text-editing-box widgets under lib/src/widgets/, are copied and adapted from
that project. They are included here, and this package is redistributed
under the same BSD 3-Clause terms, in compliance with that license's
attribution requirement.

The grading-marks feature (tick / cross / circle / question mark / number
stamps), the drawing canvas gesture handling, and the top-level
PdfAnnotatorScreen / PdfAnnotator API are original to this package.

See LICENSE for the full license text.
