This file is indexed.

/usr/share/psi-plus/certs/README is in psi-plus-common 1.2.248-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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This directory contains the SSL certificates shipped with psi. The files should be in PEM format, and should have the extension '.crt' or '.pem'.

Please use PSIDATADIR/certs for local additions.

Default value of PSIDATADIR:
  Linux, MacOS X and other Unices
     ~/.local/share/psi+/
  Windows NT, 2000, XP and Server 2003
     %UserProfile%\PsiData\ (usually C:\Documents and Settings\username\PsiData )
  Windows 95, 98 and Me
     %ProgramFiles%\Psi\PsiData\ (usually C:\Program Files\Psi\PsiData )