[TYPO3-english] typo3 7.5 file access control

[joujou]

Hi,
With Typo3 7.5 and extension advanced file metadata, there's the "access" tab for each file. In this tab, one can specify fe_groups with access granted for the file.
Even if a file has a group indicated, it can be called directly by its url.
So, I don't know how to secure my files, natively, I don't want to use non-core extensions.
Thanks