See the main page.
Demos of Octavia (not Octavia itself) are all under CC BY-NC-SA 4.0 license. Credits are advised when Octavia demos are used for recording videos. Demo MIDI files came along with Octavia demos are all credited here.
Some demos may require loading additional SysEx sound sets, and can either be included in the demos themselves, or be downloaded elsewhere. Demo 7 require JayB's X5D(R) sound set and NS5R sound set to be loaded, which can be downloaded from jaybmusic.net.
Octavia does not embed MIDI synthesizers currently, so please prepare your own pre-rendered audio files if you wish to see Octavia in action. If you wish to experience full MIDI bitmap animation experience, please watch them in demo screens with pixel blurs.