HN user
For information : since that github comment, now the protocol relies only on HTTPS.
About metadata : https://seacloud.cc/group/3/wiki/seafile-roadmap.md there is one line saying "Ability to encrypt all data by server key. Key has to be generated by administrator" but it's not on the changelog page ( https://seacloud.cc/group/3/wiki/Server%20ChangeLog.md )
There is seafile ( https://www.seafile.com/en/home/ ) which provides client side encryption.
Easy to install and to upgrade (except a small glitch in the last upgrade).
For the community version, the source code is here : https://github.com/haiwen/seafile (see others haiwen projects).
The Android client could be improved, but it does the job.
Is there other story like the Anne Franck one? Why not boycot the museum in Amsterdam, the books and speak of others stories? That's cynical? Not more than the Anne Franck copyright's holders...