WARNING: Displayed if crypographic functions like OpenPGP cannot be executed due to key strength limitation.
Some cryptographic algorithms like OpenPGP or AES-256 require unlimited key strength to be activated for the Java runtime environment. If your JRE only provides support for strong cryptography then this message is raised. If allowed in your country you could install the unlimited strength jurisdiction policy files in order to use OpenPGP/AES. Please check out the Leisenfels website for detailed information on how to do this.
Please contact the Leisenfels support if the problem still exists after performing the steps mentioned above.