Deconfusing the term permissions from security controls and privacy protection. While permissions are set in a file’s attributes, privacy is controlled through elaborate rules.
ACLs
Permissions, ACLs, TCC’s privacy controls, SIP and app sandboxes. What they are, and how you can control them to access and maintain your files.
What’s blocking you from saving that document: permissions, ACLs, privacy, an extended attribute, or what? Here are some clues.
How an obscure ACL can prevent a quarantine flag from being attached to an internet download: demonstration and explanation.
There’s a lot standing between your app and what it can edit and save: POSIX permissions, ACLs, SIP, TCC, and maybe the sandbox too.
Have you found Time Machine docs helpful in solving problems? Do you know what “custom access” means in the Permissions section of Get Info?
macOS now adds special permissions to standard folders including your Home folder, and its special folders inside it. This explains those ACLs and how to fix them.
Permissions, ACLs, SIP, TCC privacy protection, and now DataVaults – Mojave has many ways of stopping software from opening files and folders.
Setting permissions in Terminal is simple. This basic introduction explains how to understand the notation used, and save yourself time fiddling in the Finder.
When copying files across in Target mode, their permissions are left in a mess. Why?
The Eclectic Light Company 