English: The de jure flag of Košice. This is made official by the Heraldic Registry of the Slovak Republic, which shows an image of the flag (its colors likely based off the coat of arms.)
For an unknown reason, the city of Košice's government, instead, favors a flag of yellow and blue, without the swallowtail (usually with the coat of arms), which falls outside the regular pattern of Slovakian municipal flags. This flag, with its swallowtail, is rarely seen throughout.
"a) idea, manner, system, method, concept, principle, discovery or information that has been expressed, described,
explained, depicted or incorporated into a work,
b) a text of legislation, a decision of public authority or a court decision, technical norm, including draft
materials and translations thereof
c) land-use planning documents
d) state symbol, municipality symbol, symbol of self-governing region; this does not apply to a work which
formed ground for creating of such symbol,
e) speech presented in discussions on public affairs
f) daily news; daily news is information on event or circumstance; where a work informing about daily news or a
work in which daily news is included, is not considered as daily news,
g) work of traditional folk culture,
h) result of activity of expert, interpreter or translator acting under special law."
Hence it is assumed that this image has been released into the public domain. However, in some instances the use of this image might be regulated by other laws.
Please note that although this representation is protected by copyright of its author and has a free license, it is also protected by Slovak law 369/1990 Zb. o obecnom zriadení, § 1b Symboly obce[1], and therefore may not be used in Slovakia without permission from the municipality.