SFTP restrict upload file only

I have setup a sftp server using SuSe Linux, and created some accounts for sftp only.  How can I set in the server to restrict the user can only upload files, but not to download any files from the server?

Thanks.
kwlolAsked:
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nociSoftware EngineerCommented:
the best way is to move the files to another location after upload.
incron may be your friend in this.
  http://incron.aiken.cz/

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arnoldCommented:
The sftp is a component of OpenSSH.
Disabling world/group readable from the permissions might prevent the download of files not owned by the user when dealing with transferring any (*) files in the directory.

I.e chmod 733 is a write only for group/world and would be permission set restrict .. No listing of contents...

If two separate users try to transfer a file identically name could run into issues where obe overwrites the other...

Ftps is much more manageable
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