Mountain Lion Permissions changes

I just upgraded to Mountain Lion from Lion and am having some problems with permissions that I haven't run across before.
I took a screen shot that was deposited on my desktop as a png.
The permissions on the screenshot png while on the desktop were "you can read & write".
When I dragged the screenshot png to the finder I got a pop up that said "the screenshot ....can't be moved because macintosh hd can't be modified" with an "authenticate" button on the bottom of the popup screen.
When I typed in my password the png was deposited on the finder screen.
When I went to "get info" I found the permissions had changed to "you have custom access" from "you can read and write".
Then when I tried to move the png from the finder to the trash I got a popup that said "Finder wants to make changes. Type your password to allow this".
Any ideas as to what happened and what I can do so I don't have to keep typing in my password?
Thanks for your help,
Joim

Hi Linc,
Thanks for the information.
Apparently this was a change in Mountain Lion from Lion that I missed.
I've always been able to drag/drop files, etc. that I created onto the "Macintosh HD" screen with no problem and work with them, delete them or attach them to an email document without having to use my password. It'll take a bit of getting used to but I can manage.
Can you enlighten me as to the reason for this change?
Once again, thanks for your help,
Jim Coleman

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