OSX default file permissions when copying/saving files
From the terminal you can use the chmod command to change permissions. In this case the command would be chmod a+r *. This would change all files in a folder. If you want to do this from the Finder, you would have to create a service. You could then select a group of files and change all of them at once. The instructions are given below.


Open the Automator application.
Select "Service" and click "Choose".
Drag the action "Run AppleScript" to where it says "Drag actions or
files here to build your workflow".
Set "Service receives selected text in any application" to
"Service receives selected files or folders in Finder".
Replace the code

on run {input, parameters}

    (* Your script goes here *)

    return input
end run


with

on run {input, parameters}
    try
        repeat with currentfile in input
            try
                do shell script "chmod a+r " &amp; quoted form of POSIX path of currentfile
            end try
        end repeat
    end try
    return input
end run

Save service as "Readable by All".
Quit the Automator application.


The service should have been saved in the ~/Library/Services folder under the name Readable by All.workflow. If not, move it there.

Now when you highlight one or more files using the Finder application, you can right click and select "Readable by All" to change the permissions.