PostgreSQL Licensing Question for pg_crypto and tablefunc extensions

[Rumpi Gravenstein <rgravens@xxxxxxxxx>]

All,

Postgres 13.1

I am new to PostgreSQL and am unclear on how licensing works for PostgreSQL extensions.  Are pg_crypto and tablefunc licensed with the PostgreSQL community edition or do PostgreSQL extensions fall under a separate license?  I've looked for documentation on this and haven't found anything on-point.  Is there a link that describes how each extension is licensed?

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Rumpi Gravenstein