/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/ is in ruby-erubis 2.7.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/ec_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/ecpp_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/ejava_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/ejavascript_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/enhanced_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/eperl_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/ephp_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/eruby_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/escheme_rb.html
/usr/share/doc/ruby-erubis/doc-api/files/erubis/engine/optimized_rb.html