With password based systems such as Adobe PDF password protection users can share both documents and passwords with others. So PDF password protection does not ensure secure document sharing or enable secure document distribution since it cannot prevent documents from being shared with unauthorized users.
Locklizard use public key technology with a secure and secret key transfer mechanism so that keys are never exposed to users and interfaces where they can be readily exposed. Document keys are locked to authorized devices within a keystore, so if the keystore is copied to another device it will fail to work. This security mechanism stops users sharing protected documents with others and enables you to securely distribute documents without fear of them being passed on to unauthorized parties.