Software as a service; platform-as-a-Service; providing virtual machines for cloud computing; all the aforesaid relating to systems to control access to restricted areas; software as a service enabling access to cloud-based locking systems (smart locks); user authentication services using single sign-on technology for online software applications for use in restricted area access control, video surveillance and alarm monitoring systems; user authentication services using blockchain technology for use in restricted area access control, video surveillance and alarm monitoring systems; development, appearance, updating and servicing in relation to the following goods: cloud-based software for use in restricted area access control, video surveillance and alarm monitoring systems; design of prototypes in relation to the following goods: restricted area access control, video surveillance and alarm monitoring systems; design and development of new products, in relation to the following fields: access control to restricted areas