Você pode transmitir zypper o --auto-agree-with-licenses flag. Do wiki do OpenSUSE :
This is special option for the install, remove and update commands. By using this, the user declares he/she agrees with the terms of licenses the command will install, and zypper will automatically say 'yes' to the license confirmation prompt. This is useful for people installing the same set of packages on multiple machines (by an automated process) and have read all the licenses before.