OpenHistoricalMap (OHM) provides historical mapping and related data,
licensed by contributors at the object level. Contributors are strongly
encouraged to contribute data using the
license, but in the interest of protecting the rights of historical data
creators, such as academics, other open licenses, such as any combination
of CC, BY, SA, and NC are supported, as well. You are responsible for
understanding the terms of the licenses included in the data you copy,
distribute, transmit, and adapt.
You are free to copy, distribute, transmit, and adapt our data, as long as
you abide by the terms of the data you are copying, distributing, or adapting.
If you alter or build upon the data on this site, you may distribute the result
only under the terms of the underlying data objects’ licenses.
The cartography in our map tiles is licensed under the terms of the objects
the tiles contain. Our map styles and documentation are licensed under the
Creative Commons Attribution “No Rights Reserved” Public Domain license (CC0).
We do not require any OHM-specific credit separate from those
required by the underlying data. Citations, however, are appreciated
as "OpenHistoricalMap contributors"
For a browsable electronic map, OHM prefers the optional credits appear
in the lower-right corner of the map.
Read more about using our data, and how to credit us, at the OHM Licence page.
Our contributors are many, many individuals and organizations. We would
not exist without their efforts.
For further details of these, and other sources that have been used
to help improve OpenHistoricalMap, please see the Contributors
page on the OpenHistoricalMap Wiki.
Inclusion of data in OpenHistoricalMap does not imply that the original
data provider endorses OpenHistoriicalMap, provides any warranty, or
accepts any liability.
OHM contributors are reminded never to add data from any
copyrighted sources (e.g. Google Maps or printed maps) without
explicit permission from the copyright holders.
If you believe that copyrighted material has been inappropriately
added to the OpenHistoricalMap database or this site, please send email to email@example.com with "TAKEDOWN REQUEST" in the subject line.
If you have questions about your use of the OpenHistoricalMap name, please see our Trademark Policy.