node-marshal

https://github.com/dig386/node-marshal

This gem is designed for transformation of Ruby source code (eiher in the form of files or strings) to the Ruby nodes (syntax trees) used by Ruby MRI internals. Obtained nodes can be serialized to the platform-dependent binary or ASCII strings and restored and launched from serialized format. Such kind of transformation is irreversible and can be used for source code protection; the similar principle is used by RubyEncoder commercial software.