I think you misunderstood me. Here's an example. You have 2 albums where you want to hide just a few pictures from the public:
- Album 1
-- Picture 11
-- Picture 12
-- Picture 13
-- Picture 14
- Album 2
-- Picture 21
-- Picture 22
-- Picture 23
-- Picture 24
Let's assume you want to hide picture 12, 23 and 24 for guests, so we move them to a separate album:
- Album 1
-- Picture 11
-- Picture 13
-- Picture 14
- Album 2
-- Picture 21
-- Picture 22
- Album 3 (restricted permission for registered users only)
-- Picture 12
-- Picture 23
-- Picture 24
Now you set the 'Album can be viewed by' permissions of 'Album 3' to your needs. From now on guests cannot see your sensitive content. To bring that content back to the appropriate albums, we use the album keyword feature (please search the docs). Here's an example how you could assign keywords:
- Album 1 (album keyword: album_1)
-- Picture 11
-- Picture 12 (is visible again in this album because of the album keyword feature, but only for users who have access to 'Album 3')
-- Picture 13
-- Picture 14
- Album 2 (album keyword: album_2)
-- Picture 21
-- Picture 22
-- Picture 23 (is visible again in this album because of the album keyword feature, but only for users who have access to 'Album 3')
-- Picture 24 (is visible again in this album because of the album keyword feature, but only for users who have access to 'Album 3')
- Album 3 (restricted permission for registered users only)
-- Picture 12 (keyword: album_1)
-- Picture 23 (keyword: album_2)
-- Picture 24 (keyword: album_2)