Programmatically download someone's shared file?

I'm writing an app that needs to be able to download files shared by other users (via a URL, with user's consent).

Now I know by default the URL contains "dl=0" part which prevents automated DL, and I can rewrite it to "dl=1" and fetch the file. But is that the right and legal way to go? Is this a supported mechanism that will remain supported or are there plans to change/disable it? We wouldn't want to be surprised some day that there is no longer a "dl=1" parameter, that would be kind of a panic situation...