Words to Describe watermarks

How watermarks often is described ("________ watermarks")

• distinct
• secure
• embedded
• electronic
• hidden
• inverted
• high
• glacial
• invisible
• bit
• colored
• similar
• fragile
• dated
• highest
• several
• century
• chaotic
• italian
• fake
• valid
• perceptible
• digital
• genuine
• identical
• faint
• artificial
• resistant
• corresponding
• based
• imperceptible
• low
• visible
• brown
• heraldic
• discernible
• perceptual
• russian
• european
• distinctive
• robust
• multiplicative
• earliest
• numerous
• audio
• medieval
• secret
• different
• additive
• special
• early
• false
• elaborate
• random
• ancient
• multiple
• level