This is taken from the confirmation received from RFC when I bought a ticket for Feyenoord away.
** FORM OF UNDERTAKING ** I acknowledge that in applying for this ticket, and as a condition of any tickets or tickets being issued to me, I am aware of, endorse and will comply in all respects with Article 14 of UEFA disciplinary regulations on racism and other discriminatory conduct. I shall not indulge in behaviour which insults the human dignity of a person or group of persons on whatever grounds, including skin colour, race, religion, ethnic origin, gender or sexual orientation and shall not sing any words that could be construed as having that effect. Any song that includes abusive language that is directed at any persons or groups within the above categories would breach this undertaking regardless of the word or words used to describe such person or groups and whether or not it can be argued that the word has some other meaning. I acknowledge that any breach of this undertaking will result in my being denied tickets for all future matches involving Rangers Football Club and that any tickets that I have already purchased will be cancelled.
Thank you for purchasing items with Rangers Football Club Limited.