CUPS-PDF reset every day and permission was auto change

I install cups and cups-pdf to ubuntu. The pdf file from client print to cups will put in /var/spool/cups-pdf/ANONYMOUS/. I change permission of /var/spool/cups-pdf/ANONYMOUS/ to 777 for read or remove file in this folder. I use python urllib to read cups website https://127.0.0.1:631 It look like cups auto reset connection every night. So, permission was…

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