A Strong Password is at least 8 characters long and consists of:

* at least 1 upper case letter
* at least 1 lower case letter
* at least 1 digit or sign

Note, that if an active account has not set a strong password in the past, the old weak password still can be used to login.

In order to change your account, e.g. changing the privilege password used for shared building or SDK based applications, a strong password is required first.
The privilege password itself may continue as weak password.

All new and re-activated accounts are already equipped with strong passwords.