After uploading an item and going to the detail page (where you can edit the thumbnail, summary and description) there is the "Terms of Use" section. A long time ago I found that you could just input the abbreviation for the license "PDDL" and when you visited the item on the Open Data / Hub page the PDDL would be a link to the terms of the license on the https://www.opendatacommons.org/ website.
At some point, the Open Data Commons website updated their site structure and the ArcGIS Hub link no longer works.
This page:
AnnexationHistory
Has PDDL link to this page: https://opendatacommons.org/licenses/pddl/summary
<Error>
<Code>NoSuchKey</Code>
<Message>The specified key does not exist.</Message>
<Details>
No such object: opendatacommons.org/licenses/pddl/summary
</Details>
</Error>
But it should be linking to https://opendatacommons.org/licenses/pddl/summary/index.html
That link is automatically created just by typing in PDDL. Hopefully the right person will see this and update the backend to point to the correct page.
Thanks-
Trevor