Licences

go-embedded-r/r is BSD-3-Clause (see its LICENSE). The sources of R are GPL-2-or-later, so:

• R is an oracle, never a source. R is run as a black box and what it prints is recorded. No R source file, no R test file, no R help page, no .Rout.save transcript and no text of R’s manuals is copied into the repository, and none is downloaded at run time. The golden files are the answers of R 4.6.2 to inputs written there.
• Base R’s R code is rewritten, not copied. The R-language parts of the base packages (base, stats, utils, methods, …) will be re-implemented under the BSD licence from the documented behaviour and from what the oracle does. Fetching the GPL code on first use, and a GPL port, were considered and rejected (decision of 2026-11-01, recorded in the roadmap).
• Contributors work from specifications: the R Language Definition, the R Internals manual, the help pages, and the oracle’s behaviour. Do not open src/main, src/nmath or the R code of the base packages while writing the counterpart. See CONTRIBUTING.md and NOTICE.