Attribution
Last updated: June 18, 2026
LongboxIQ uses comic metadata from licensed and approved sources. We provide attribution as required by each source's terms.
Grand Comics Database (GCD)
- Comic metadata provided in part by the Grand Comics Database under CC BY-SA 4.0.
- Source: https://www.comics.org/
- License: Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
- GCD is our primary metadata source for publishers, series, issues, creators, and publication details.
Metron
Secondary metadata for modern issues, characters, story arcs, and variants. Used with API terms compliance and stored source IDs. Source: https://metron.cloud/
User Contributions
Issue Guides and collector notes may incorporate approved user submissions and original editorial writing reviewed by LongboxIQ staff.
Cover Images
Cover images are not assumed to be freely reusable. LongboxIQ uses user-uploaded photos, placeholders, or licensed sources. Copyright for cover artwork belongs to respective rights holders.
What We Do Not Use
Comic Vine API is not used as a core commercial data source due to non-commercial licensing restrictions.