In the US if the controller does not restate the previous restrictions they are cancelled and you are cleared unrestricted to FL270. I have heard some controllers make statements such as comply with previous restrictions then climb and maintain. It is not technically correct but conveys the idea. As a pilot and controller if I was issued that climb to FL270, I would read back "Nxxxx climbing unrestricted to FL270" Put it back on the controller to correct it if that is not what he/she meant.