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How to remove metadata "Keywords" information?

Registered: Oct 12 2011
Posts: 17

I can remove metadata "Title", "Author", "Subject" successfully by codes below: = ""; = ""; = "";
But when I try to move metadata "Keywords", the following code doesn't work: = "";
It will add a semicolon before the original information, e.g. the original "Keywords" field is "abcdefg", after running the following code, it changes to ";abcdefg":
could you kindly advise how to remove all "Keywords" information by JavaScript? Thanks a lot!
PS: I know this can be realized by Batch Processing of Acrobat, but I need to do this by JavaScript. :(

My Product Information:
Acrobat Pro 8.1.6, Windows
Registered: Jul 6 2008
Posts: 1875
See this previous topic for more information: