Security certificates are what used (automatically) to encrypt and authenticate their sessions with our servers. It’s there for the player’s security as it ‘certifies’ that the they are indeed connecting to the right resource (BVLV or BDEU servers) and that no one can eavesdrop on their online activity during that play or betting session. Microsoft includes certificate updates as part of its Windows update program but this isn’t 100% reliable and some users may have automatic updates turned off.