Whether a cos star will be issued a lawyer's letter when taking to the streets depends on whether it constitutes infringement.
In addition to restoring famous scenes in movies and TV series, many netizens also imitate certain expressions and attitudes of stars and celebrities. The imitator may simply look more like the star himself, or imitate the star through makeup techniques, dressing style, performance content, etc. If the imitator does not imitate the celebrity's style for commercial purposes, does not make profits, and does not vilify or demean the celebrity's personal image, it is not enough to constitute an infringement.
However, if the imitation is for commercial purposes, or if the imitation process vilifies or derogates the personal image of the star, causing public confusion or cognitive bias, it may constitute an infringement of the celebrity's name rights, portrait rights and other personality rights. In case of copyright infringement, the imitator may receive a letter from a lawyer.
The legal basis for whether COS stars will issue lawyer letters when taking to the streets:
Article 38 of the Copyright Law of the People's Republic of China stipulates that if you use other people's works for performances, Performers should obtain permission from the copyright owner and pay remuneration. When a performance organizer organizes a performance, he or she must obtain permission from the copyright holder and pay remuneration. However, Article 24 of the Copyright Law also stipulates that for personal study, research or appreciation, the use of published works or the free performance of published works is prohibited.
Performances that do not charge the public or pay remuneration to the performers and are not for profit may be performed without the permission of the copyright owner and without payment of remuneration, but the name of the author or the name of the author and the title of the work must be specified. And it must not hinder the normal use of the work or reasonably damage the legitimate rights and interests of the copyright owner.
Refer to the above: Baidu Encyclopedia - Copyright Law of the People's Republic of China