Licences and third-party notices

Platform software is Apache-2.0. Earlier attempts and statement excerpts use their recorded licences. Erdős pages display attributed restatements from those manuscripts and link to the original problem and Tao’s database. Top Open Problems statements carry their per-record licence; Oberwolfach-derived material retains CC-BY-SA-4.0 attribution. MathOverflow statements remain linked under their recorded terms. Original papers retain their own rights; summaries do not relicense them. Every record and revision package includes its specific rights metadata.