CA Librarian does not interpret or use passphrases used in security packages such as RACF, CA Top Secret or CA ACF2.
If a security system is set up to use 8 character passwords or 100 character passphrases, it has no impact CA Librarian.
Any password that might be setup to access a member on CA Librarian is the 4 character CA Librarian-specific password that can be found by running a CA Librarian Master File Index report.