These social norms are explicitly expected to evolve and mature if the number of contributors to the project grows. It is important to have some policies as a starting point, but also important not to set these policies in stone until they have been reviewed.
The Fatcat catalog content license is the Creative Commons Zero ("CC-0") license, which is effectively a public domain grant. This applies to the catalog metadata itself (titles, entity relationships, citation metadata, URLs, hashes, identifiers), as well as "meta-meta-data" provided by editors (edit descriptions, provenance metadata, etc).
The core catalog is designed to contain only factual information: "this work, known by this title and with these third-party identifiers, is believed to be represented by these files and published under such-and-such venue". As a norm, sourcing metadata (for attribution and provenance) is retained for each edit made to the catalog.
A notable exception to this policy are abstracts, for which no copyright claims or license is made. Abstract content is kept separate from core catalog metadata; downstream users need to make their own decision regarding reuse and distribution of this material.
As a social norm, it is expected (and appreciated!) that downstream users of the public API and/or bulk exports provide attribution, and even transitive attribution (acknowledging the original source of metadata contributed to Fatcat). As an academic norm, researchers are encouraged to cite the corpus as a dataset (when this option becomes available). However, neither of these norms are enforced via the copyright mechanism.
As a strong norm, editors should expect full access to the full corpus and edit history, including all of their contributions.
All editors agree to the licensing terms, and understand that their full public history of contributions is made irrevocably public. Edits and contributions may be reverted, but the history (and content) of their edits are retained. Edit history is not removed from the corpus on the request of an editor or when an editor closes their account.
In an emergency situation, such as non-bibliographic content getting encoded in the corpus by bypassing normal filters (eg, base64 encoding hate crime content or exploitative photos, as has happened to some blockchain projects), the ecosystem may decide to collectively, in a coordinated manner, expunge specific records from their history.
This guide ("The Fatcat Guide") is licensed under the Creative Commons Attribution license.
The Fatcat software project licensing policy is to adopt strong copyleft licenses for server software (where the majority of software development takes place), permissive licenses for client library and bot framework software, and CC-0 (public grant) licensing for declarative interface specifications (such as SQL schemas and REST API specifications).