# Media credits for Unit 25 {#agc-media-credits-unit-25}

Lecture 25, Worksheet 25, and both frozen public solutions contain no
substantive reader media positions. Exercise 25.13 asks the reader to draw
an image using suitable software, but the source supplies no image file
for that exercise. The two official upstream PDFs are retained solely as
visual/build authority witnesses and retain their own component rights
and attributions, as recorded in
`authority/ASSET_CLOSURE-unit-25.json` and
`authority/RIGHTS-unit-25.csv`.

Rights note: the file-description pages for both 2012 PDFs retain the older
CC BY-SA 2.0 Germany statement alongside the current print/course version
statement, CC BY-SA 4.0. The edition records both routes and does not grant
a new blanket licence over the PDF files. The lecture PDF has seven pages
and the worksheet PDF has three pages. Both have extractable text, but are
untagged, have no structure tree, specify no document language, and have
no document outline.

Holger Brenner's upstream semantic text and its derivative translation
follow the CC BY-SA 4.0 route; other components retain their respective
rights. This English edition is an independent derivative and implies no
endorsement by, or official affiliation with, the author or Wikiversity.
Translation, checking, and production of the edition were assisted by
**OpenAI Codex gpt-5.6-sol, Ultra.**

The contributor to the frozen revisions of the Lecture 25 and Worksheet
25 root pages is recorded as Arbota. The contributor to the frozen
revision of the solution to Exercise 25.1 is Bocardodarapti, whereas the
contributor to the frozen revision of the solution to Exercise 25.2 is
Arbota. Course authorship credit to Holger Brenner and these revision
credits are distinct relationships; the `oldid` links and frozen XML
preserve a verifiable attribution history.