I hope he got written consent from the IOC to have tattooed upon his torso the protected mark known as the Olympic Rings.
http://registration.olympic.org/en/faq/detail/id/25
For your convenience here is Chapter 1 Rule 7 Clause 4 of the Olympic Charter in full:
'The Olympic symbol, flag, motto, anthem, identifications (including but not limited to “Olympic Games” and “Games of the Olympiad”), designations, emblems, flame and torches, as defined in Rules 8-14 below, and any other musical works, audio-visual works or other creative works or artefacts commissioned in connection with the Olympic Games by the IOC, the NOCs and/or the OCOGs, may, for convenience, be collectively or individually referred to as “Olympic properties". All rights to the Olympic properties, as well as all rights to the use thereof, belong exclusively to the IOC, including but
not limited to the use for any profit-making, commercial or advertising purposes. The IOC may license all or part of its rights on terms and conditions set forth by the IOC Executive Board.'
The IOC is very protective of its properties. They may want their pound of flesh.
https://www.marketingweek.com/2012/07/20/top-olympic-branding-breaches/