XiDs is a solution enabling access to buildings, objects and rooms using a mobile device for anyone who wants to be one step ahead. For business clients (multifunctional buildings, administrative buildings, hotels and guesthouses) it can be built as a superstructure of existing access technologies and systems, and for individuals and households it is a very simple and popular internet smart solution. XiDs is built on the reverse procedure of verifying access rights, where the mobile is the reader and the QR code identifies the door, gate, lock that you want to open. XiDs can save money spent on technological devices, readers, plastic access cards, fobs, broken and lost keys, opening slammed doors... Make your life easier by letting your mobile phone be the key to all the doors and gates you pass through or you will walk and no longer look for the right key on your key chain or the right card in your wallet. You grant your guests and visitors access to your facility using an electronic invitation, and only you decide whether the granted access is permanent or time-limited...