In the US, insults are not something for which you can be prosecuted. Calling someone a son of a bitch is not defamatory. No one believes you are really the child of a dog. So that is an opinion. Defamation requires a false factual statement. Truth is a complete defense.
What is Public Key Infrastructure (PKI)? Public Key Infrastructure (PKI) is a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates. In cryptography, a PKI is an arrangement that binds public keys with respective user identities by means of a certificate authority (CA). Wikipedia.org
A Byki list is a collection of learnable information, usually a set of words or phrases in a foreign language, expressed on flash cards. Byki lists may include sound or images for each card and may be viewed on Byki.com, or downloaded for use in the Express or Deluxe versions of the Byki software for PCs and Macs. Lists can also be downloaded onto a smartphone with the Byki for iPhone and Byki for Android apps.