When encrypting a document with a public key I got a warning:
$gpg --encrypt -r 6B7F10E4 file.pdf
It is NOT certain that the key belongs to the person named
in the user ID. If you *really* know what you are doing,
you may answer the next question with yes.
Use this key anyway? (y/N)
I set the trust level to 4 and signed the key:
$ gpg --edit-key 6B7F10E4
gpg> trust
Please decide how far you trust this user to correctly verify other users' keys
(by looking at passports, checking fingerprints from different sources, etc.)
1 = I don't know or won't say
2 = I do NOT trust
3 = I trust marginally
4 = I trust fully
5 = I trust ultimately
m = back to the main menu
Your decision?
4 <Enter>
gpg> sign
Are you sure that you want to sign this key with your
key ... (8F3A3A54)
Really sign? (y/N)
y <Enter>
gpg> save
But I still get that warning when encrypting documents with that key. What else do I need to do to remove it?