These logs were taken from the 4TU.ResearchData log repository located at https://data.4tu.nl/repository/collection:event_logs_real

And they were published under the license found on https://researchdata.4tu.nl/fileadmin/editor_upload/pdf/Terms_of_use/General_terms_of_use_4TU.ResearchData.pdf

In particular, the terms of license obligate to cite the authors:

BPI Challenge 2013 logs:
Ward Steeman

Receipt phase of an environmental permit application process (‘WABO’), CoSeLoG project:
Buijs, J.C.A.M.

BPI Challenge 2017:
van Dongen, B.F. (Boudewijn)