PDDL
The Open Data Commons Public Domain Dedication: the city gives up its rights entirely. The most permissive rung on this ladder, and the rarest.
How this list is decided. Membership is not a field an editor set: it is every published entry whose own text names PDDL, matched at build time, with the sentence printed under each row so you can judge the match yourself. 11 entries in 7 cities.
✔ Every published entry is checked against the public sources it cites before publication.
Where it appears in the atlas
The policy names CC BY 4.0 as the default licence; the portal ships PDDL public-domain dedications instead.
The dataset and the licence position: Open Data Commons Public Domain Dedication and License (PDDL), updated daily, publisher Department of Innovation and Technology, provider Boston 311, source the city CRM, with per-year CSV files from 2011 to 2026.
The maps themselves, under the Open Data Commons Public Domain Dedication and License (PDDL), served as an ArcGIS GeoService REST API by Boston Maps.
The data layer, and the licence answer: 'Open Data Commons Public Domain Dedication and License (PDDL)'.
There's no formal open license — the portal's terms just ask users to cite the source and disclaim accuracy after download, a step behind CC0/PDDL portals like Zürich's or Boston's.
Use is free and non-discriminatory, but it is not an open licence in the CC0/PDDL sense: the municipal government's record of the terms requires crediting "Guangzhou Public Data Open Platform" as the source, forbids reselling the data, and asks users to register their intended use.
A large, long-running catalog is not the same claim as an open license — reserving 'all rights' in the terms of use puts Philadelphia's own datasets closer to nyc-open-data's no-dedication default than to the PDDL cities.
Unusually for a US city, the data carries a recognised open licence, PDDL 1.0, and the inventory Chapter 22D requires is itself published as a dataset.
Socrata metadata names the licence as the Open Data Commons Public Domain Dedication and License, PDDL 1.0 — an actual dedication instrument, not merely an absence of terms.
Counted the same day from the CKAN API of the national portal datos.gob.cl: 3,149 datasets from 231 publishing organisations, of which 1,313 are Creative Commons Non-Commercial, 922 CC BY, 421 CC0, 352 ODC-PDDL, 52 ODC-BY, 50 ODbL and 23 explicitly unspecified.
Stockholm illustrates the gap between 'freely reusable' language and a formal open license: the Traffic Office's own portal calls its data 'license-free', but no CC0/CC-BY/PDDL dedication could be confirmed for the city's open-data effort as a whole, and the main catalog's JavaScript-only interface makes even a basi…
Others in this group
The whole layer
Every standard, protocol and licence the atlas names, with the open-data licence ladder in one table: Standards & licences.