This file depicts the flag of a German Körperschaft des öffentlichen Rechts (corporation governed by public law). According to § 5 Abs. 1 of the German Copyright law, official works like flags are gemeinfrei (in the public domain).
Note: The usage of flags is governed by legal restrictions, independent of the copyright status of the depiction shown here.

This work is not an object of copyright according to article 1259 of Book IV of the Civil Code of the Russian Federation No. 230-FZ of December 18, 2006.

Shall not be objects of copyright:

• official documents of state government agencies and local government agencies of municipal formations, including laws, other legal texts, judicial decisions, other materials of legislative, administrative and judicial character, official documents of international organizations, as well as their official translations;
• state symbols and signs (flags, emblems, orders, any forms of money, and the like), as well as symbols and signs of municipal formations;
• works of folk art (folklore), which don't have specific authors;
• news reports on events and facts, which have a purely informational character (daily news reports, television programs, transportation schedules, and the like).

This image is in the public domain according to Article 4, case 2 of the Polish Copyright Law Act of February 4, 1994 (Dz. U. z 2022 r. poz. 2509 with later changes) "normative acts and drafts thereof as well as official documents, materials, signs and symbols are not subject to copyrights". Hence it is assumed that this image has been released into public domain. However in some instances the use of this image in Poland might be regulated by other laws.

According to the Republic of Lithuania Law on Copyright and Related Rights (passed on May 18, 1999 and amended 2010) Chapter II, Section 1:

Article 5. Works not Attributed to the Subject Matter of Copyright Copyright shall not apply to:

 1) ideas, procedures, processes, systems, methods of operation, concepts, principles, discoveries or mere data;

 2) legal acts, official documents texts of administrative, legal or regulative nature (decisions, rulings, regulations, norms, territorial planning and other official documents), as well as their official translations;

 3) official State symbols and insignia (flags, coat-of-arms, anthems, banknote designs, and other State symbols and insignia) the protection of which is regulated by other legal acts;

 4) officially registered drafts of legal acts;

 5) regular information reports on events;

 6) folklore works.

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.