If you want to use a specific security provider for handling encrypted files in FormVu, then you can use -Dorg.jpedal.securityprovider. Remember to add the security provider to the classpath if needed, example usage would be:
We use our own implementation to decrypt encrypted pdf files in FormVu. This will be used if you do not specify a security provider.
To learn more about Providers in Java we recommend reading The Provider Class section of the Java Cryptography Architecture (JCA) Reference Guide.