I did not find the answer after many of reseaches. My usecase is:
- User login and register their device, it maybe a phone,a tablet, or a computer.
- They can purchase and download an item on registered device
I know that Mac Address can not be detected by Javascript, so, is there another way to detect that is 1 of their regitered devices?
Update: Cookie and LocalSorage is the same, because 1 device can use multi type of Browsers IE, Chrome, FireFox... Assume when user register their device, the server will create UniqueID for it and return in JSON format, so the main key is now that how does client webapp save this UniqueID and share it for all browsers?