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Description
The following paragraph is taken from RFC 2440 - OpenPGP messages format, part 5.2.3.12.:
«(1 octet "level" (depth), 1 octet of trust amount)
Signer asserts that the key is not only valid, but also trustworthy,
at the specified level. Level 0 has the same meaning as an ordinary
validity signature. Level 1 means that the signed key is asserted to
be a valid trusted introducer, with the 2nd octet of the body
specifying the degree of trust. Level 2 means that the signed key is
asserted to be trusted to issue level 1 trust signatures, i.e. that
it is a "meta introducer". Generally, a level n trust signature
asserts that a key is trusted to issue level n-1 trust signatures.
The trust amount is in a range from 0-255, interpreted such that
values less than 120 indicate partial trust and values of 120 or
greater indicate complete trust. »
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