Action with JS as documented by Adobe without result

I found the following to change (in my case insert) copyright information in the meta-tags of a PDF:

http://help.adobe.com/livedocs/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Acrobat…

I created in Acrobat Pro 10.1.16 an action, from the tools the "run JavaScript" and copied the JS from the link in the window which opens when clicking the options.

After running the action the copyright information (cmd + D -> additional Metadata) remain as before (unknown status and empty Copyright-Info and Copyright-URL).

Must I change somewhere settings or does someone know where I made my mistake??