Clarify that license does not include all files in /sources

README.md

@@ -28,6 +28,8 @@ For boreholes with many profiles (e.g. from automated loggers), pairs of `profil
 
 Folder [`sources`](sources) contains subfolders (with names matching column `source.id`) with files that document how and from where the data was extracted. Files with a `.png`, `.jpg`, or `.pdf` extension are figures, tables, maps, or text from the publication. Pairs of files with `.pgw` and `.{png|jpg}.aux.xml` extensions georeference a `.{png|jpg}` image, and files with `.geojson` extension are the subsequently-extracted spatial coordinates. Files with an `.xml` extension document how numeric values were extracted from maps and figures using [Plot Digitizer](https://plotdigitizer.sourceforge.net). Of these, digitized temperature profiles are named `{borehole.id}_{profile.id}{suffix}` where `borehole.id` and `profile.id` are either a single value or a hyphenated range (e.g. `1-8`). Those without the optional `suffix` use `temperature` and `depth` as axis names. Those with a `suffix` are unusual cases which, for example, may be part of a series (e.g. `_lower`) or use a non-standard axis (e.g. `_date`).
 
+_The repository's [license](LICENSE.md) does not extend to figures, tables, maps, or text extracted from publications. These are included in the `sources` folder for transparency and reproducibility._
+
 ## Submitter guide
 
 To submit data, send an email to jacquemart@vaw.baug.ethz.ch. Please structure your data as either comma-separated values (CSV) files (`borehole.csv` and `measurement.csv`) or as an Excel file (with sheets `borehole` and `measurement`). The required and optional columns for each table are described below and in the submission metadata: [`submission/datapackage.yaml`](submission/datapackage.yaml). Consider using our handy Excel template: [`submission/template.xlsx`](submission/template.xlsx)!