Computer network security consultancy; Computer security consultancy in the field of scanning and penetration testing of computers and networks to assess information security vulnerability; Computer security service, namely, hard drive erasure; Computer security service, namely, restricting access to and by computer networks to and of undesired web sites, media and individuals and facilities; Computer security services in the nature of administering digital certificates; Computer security services in the nature of administering digital keys; Computer security services in the nature of providing authentication, issuance, validation and revocation of digital certificates; Computer security services, namely, enforcing, restricting and controlling access privileges of users of computing resources for cloud, mobile or network resources based on assigned credentials; Telecommunication network security consultancy; Updating of computer software relating to computer security and prevention of computer risks