Hi remus
Basically the last 7 gives read, write, and execute rights for that folder to everyone, however, it does
not automatically extend to the files in that folder. That means you open the folder to everyone and
can restrict access on a file by file basis if you want to. The three 7's from left to right refer to owner,
group, and anyone. The 7 comes from adding up 4 + 2 + 1 which have the following meanings
4=Read Access
2=Write Access
1=Execute Rights
So changing a 7 to a 4 would make that file or folder read only for the owner, group or user depending
on which 7 you changed. If you want a file to be Executable you must also enable Read Access. That's
a very basic explanation of permissions, google if you want more advanced techniques.