IMoreover, my audit showed that Free Vision itself contains quite a lot of code that overlaps with Borland's code. Some or all of it may possibly not be copyrightable as trivial code, but I haven't investigated that question deeply.
I am interested in this claim, because from what I know Free Vision is based on Leon de Boer's C++ graphics vision. Quote from wiki:
This was found in the shape of Free Vision, which (afaik) was a backport of the PD C++ code back to Pascal by Leon de Boer for use in graphics mode. As far as I can remember, Pierre and Peter backported the code back to textmode (coordinate system change that affected a lot of code!), ported missing parts, improved compatibility, and hooked it into the Textmode IDE. Note that the sf.net TVISION page falsely states that FPC uses Pascal sources donated by Borland, however it seems that nobody reacts to mails there.
You can try running audit tool yourself:
https://github.com/unxed/dn/tree/main/audit#how-to-check-another-pascal-code-base-for-example-free-vision
