/usr/share/pstoedit/safer.ps is in pstoedit 3.70-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | % disallow all file ops
/file { (Your PostScript program tried to use an unsafe operation \(file\) \n) print quit } bind def
/renamefile { (Your PostScript program tried to use an unsafe operation \(renamefile\) \n) print quit } bind def
/deletefile { (Your PostScript program tried to use an unsafe operation \(deletefile\) \n) print quit } bind def
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