Need log the who downloaded attachments

[tophee (Christoph)]

Note that attachments can be downloaded by anyone who has the link.

File attachments in restricted categories should be restricted

Currently, files that are uploaded to a restricted category are accessible to anyone, even users who are not logged in. Chances are that these files get indexed by search engines and thus become public. I agree with @tobiaseigen that this is quite a serious issue: But I am not sure what exactly the current state of affairs is regarding this, except that, some time ago, @dmitry_fedyuk created the restrict files plugin whose latest version seems to be 2.1 which is confirmed to be compatible with…