英文關鍵字
agreement
approval
background
business
certificate
certify
classified
concept
confidential
contract
document
finance
government
grunge
icon
illustration
important
information
ink
isolated
justice
label
lawyer
letter
mark
official
old
paper
paperwork
pressure
privacy
private
restricted
rubber
seal
secrecy
secret
security
signature
stamp
stamper
symbol
testament
text
top
vintage
working
workplace