Clarify licenses

Author: cwickham

README.md

@@ -25,3 +25,20 @@ yarn dev-vscode  # run development/debug version of extension
 Use the VS Code **Run and Debug** pane in the activity bar to run a version of VS Code with the development build of the extension.
 
 See our [`CONTRIBUTING`](https://github.com/quarto-dev/quarto/blob/main/apps/vscode/CONTRIBUTING.md) file for more information
+
+## Licenses
+
+This repository contains code under multiple open source licenses:
+
+| Component | License |
+|-----------|---------|
+| [VS Code Extension](apps/vscode/package.json) | AGPL-3.0 |
+| [Language Server](apps/lsp/package.json) | AGPL-3.0 |
+| [Visual Editor](packages/editor/package.json) | AGPL-3.0 |
+| [Panmirror](apps/panmirror/package.json) (RStudio integration) | AGPL-3.0 |
+| @quarto/* npm packages | MIT (e.g. [mapped-string](packages/mapped-string/package.json)) |
+| OJS Runtime | ISC (e.g. [quarto-ojs-runtime](packages/ojs/quarto-ojs-runtime/package.json)) |
+
+Individual package licenses are specified in each package's `package.json` file.
+
+Note that the [Quarto CLI](https://github.com/quarto-dev/quarto-cli) is in a separate repository and is MIT licensed. See the [Quarto license page](https://quarto.org/license.html) for an overview of licensing across all Quarto projects.