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8 Trust Values
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Trust values are used to indicate ownertrust and validity of keys and
user IDs.  They are displayed with letters or strings:

-
unknown
     No ownertrust assigned / not yet calculated.

e
expired

     Trust calculation has failed; probably due to an expired key.

q
undefined, undef
     Not enough information for calculation.

n
never
     Never trust this key.

m
marginal
     Marginally trusted.

f
full
     Fully trusted.

u
ultimate
     Ultimately trusted.

r
revoked
     For validity only: the key or the user ID has been revoked.

?
err
     The program encountered an unknown trust value.