Try our classification and data leak prevention tool for Office applications (Outlook and Word) for marking your documents: ClassifyIt v5.1 (Oct 2016) Prices start at € 10 (per license)
v5.1 improvements: encrypt email attachments, integrity check for configuration file.

Upcoming versions will improve the encryption to include 'user-password' based encryption and PKI based encryption.

PAD File

 CertManager  Generate X.509 Digital Certificates, including a Root CA, Sub-CAs and User Certificates.
   Generate secure passwords with our free of charge Diceware applicaiton.