(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::encipherImage — Enciphers an image
Converts plain pixels to enciphered pixels. The image is not readable until it has been deciphered using Imagick::decipherImage() This method is available if Imagick has been compiled against ImageMagick version 6.3.9 or newer.
passphrase
The passphrase
Returns true
on success.