What does royalty free mean?

Royalty free means you just need to pay for rights to use the item once per (commercial or monetized) end product. You don't need to pay additional or ongoing fees for each person who sees or uses it.

What license do I need? (Only for monetized or commercial projects)

It depends on several factors. Click here to get an overview about the different license types: goo.gl/IMBQe5. You can purchase a license for this particular track here: http://goo.gl/KJfdX3.

Can I use this song for free? (Only for non-monetized or non-commercial projects)

You can use this track for free in non-monetized and non-commercial projects. This track is registered to the content-ID system Adrev. If you use it in your work Adrev's content-ID tracking system will detect your video using my music and give you a third party copyright match notification.
This is only a notification. Your video won't be taken down nor will your channel get flagged. Adrev will only monetize it by placing short ads in front of it and generate ad revenue for me. This way you don't have to spend money but I can still receive payment by advertisments and treat this channel as the job it is.
To assure everything proceeds without problems please comply with these three conditions:

1. The work in which this track is used must be non-commercial (no monetizing or gaining money in any other form).

2. You must give credit to me by mentioning my contact information in your description:

License: goo.gl/tKl3WG
Download: goo.gl/5gdHVR
Facebook: goo.gl/ZdgFJ9
Soundcloud: goo.gl/oue1Ro
Youtube: goo.gl/nFB64R
Contact: mechanicvibes@gmx.de

3. If remixed or changed in any other way, the derivative track must be distributed under the conditions above.

Title: The Prophecy
Composer: Christian Baczyk
Postproduction: Kevin Mantey
Image: https://goo.gl/gfHTqT

The Prophecy

Ionut Mirel Udrea (Member Of APRA/AMCOS) is a music composer, piano player and music producer based in Sydney - Australia. 
Ionut Mirel Udrea composes emotive piano-based instrumental music.

Unicorn is unicorn is unicorn is unicorn is unicorn is definitely unicorn

Also a smol composer unicorn. Also a smol producer unicorn. Also a smol guitarist unicorn. Also a smol drummer unicorn.

"If it sounds bad, don't blame the library or tools. Blame the composer, arranger, and orchestrator. They all happen to be me. Blame me."

Guitars by: smol unicorn
Instrument Programming by: smol unicorn
Orchestration and Arrangement by: smol unicorn
Mixing and Mastering by: smol unicorn

Gear:
Ibanez RG350EXZ (E Standard, 09-42)
Ibanez GRG250M-BKN (12-56 Drop A, AEADGB)
STL Tones Emissary, NadIR
Roland Rubix22
Novation Launchkey Mini (25-key)
Arturia Keylab 88 MKII

Software:
REAPER, Ableton, Pro Tools
Sonatina Orchestra, Spitfire LABS (Strings, Piano), Spitfire BBC Symphonic Orchestra Core, MeldaProduction Free FX Suite
Tunefish 4, Helm, Vital, VCV (Synths)
Samples from Boom Library, and AVA Instinct (Free version)

The Prophecy

Mechanic Vibes