You can install and login(with the same Subscription account) to the AxCrypt app with the n number of devices.But If you are the only person is going to use, then you can use it. Otherwise, you need to share your account password to all users who are all using the same account. Sometimes this leads to a security breach.
Still, if you are facing any questions/issues, please write to Support@axcrypt.net. we are happy to help you.