fedora的perl-IO-Socket-SSL软件包在安装之后会在doc目录下安装certs文件夹，这个文件夹下.pem等文件是否有用？
rpm -ql perl-IO-Socket-SSL：
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/client-cert.pem
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/client-key.enc
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/client-key.pem
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/my-ca.pem
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/proxyca.pem
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/server-cert.pem
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/server-key.enc
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/server-key.pem
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/server-rsa384-dh.pem
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/server-wildcard.pem
/usr/share/doc/perl-IO-Socket-SSL-1.94/certs/test-ca.pem
这些文件有用吗，包括.pem，可以删除吗？
我的理解是不是给用户参考用的，并没有实际功能作用？
