linn.pdf, linn.txt
  Source: OCRmyPDF test suite / Wikimedia Commons
  Copyright: (C) 1985 Forat Electronics
  License: GFDL-1.2-or-later OR CC-BY-SA-3.0

korean_1.jpg
  Source: PaddleOCR (docs/images/korean_1.jpg)
  Copyright: PaddlePaddle Authors
  License: Apache-2.0

sample.pdf, sample_eng.png
  Generated test images, no external copyright.
