Source: http://www.1uptravel.com/flag/flags/lt.html
Timestamp: 2019-04-21 06:17:40+00:00

Document:
The website of the Lithuanian Parliament <www.lrs.lt> has a search engine, using which I downloaded the full text of the law on the Lithuanian State flag. URL for the search engine is <www3.lrs.lt/n/eng/DPaieska.html>.
Art. 1. Colours of the flag and their arrangement in horizontal and vertical hosting.
Art. 2. Proportion of the flag and dimension of the flagstaff.
Art. 3. Places where the flag shall be displayed.
Art. 4. Hours of display of the flag.
Art. 5. Use of historical, local anf foreign flags.
Art. 6. Precedence among flags.
Art. 8. Private use of the flag.
Art. 9. Use on the flag on building facades.
Art. 10. Use of the flag likeliness on airplanes.
Art. 11. Use of the flag likeliness as decoration.
Art. 12. Implementation of the law.
Art. 13. Supervision of the implementation of the law.
Art. 14. Manufacture of the flag.
Art. 15. Respect and outrage to the flag.
The Lithuanian State Flag shall be the national flag-cloth, consisting of three equal horizontal coloured stripes, arranged with the yellow above, the green in the middle, and the red below. When the Lithuanian State Flag is displayed vertically, the yellow stripe must be on the left side, the green stripe in the middle, and the red stripe on the right side.
The Lithuanian State Flag must be 1 metre in width and 2 metres in length, and a flagstaff must be 3.4 metres in length. The flag and its likeness may be of other dimensions but the width of the flag in proportion to its length must always be 1:2, and the length of the flag in proportion to the length of the staff must be 1:1.7. The flag and its likeness must always correspond with the standard likeness of the colours of the Lithuanian State Flag.
1) daily near the Supreme Council of the Republic of Lithuania, the Government of the Republic of Lithuania, the buildings of the councils of local governments, and, also, on the Tower of the Gediminas' Castle in Vilnius and on the buildings, specified by the councils of local governments. Only the Lithuanian State Flag shall be displayed daily near the governmental institutions of the Republic of Lithuania. The display of the flags of other states near and inside the governmental institutions of the Republic of Lithuania shall be prohibited with the exception of cases specified in Article 5 of this Law.
10) in national defence units pursuant to the statutes of the national defence service.
In cases specified in Paragraph 2 of Article 3 of this Law, the Lithuanian State Flag shall be hoisted at 7 o'clock and lowered at 22 o'clock, and in cases specified in Paragraph 7 of Article 3 - during the time of voting.
The order of approval and use of historical or new sample flags of towns and districts shall be established by laws. The flags of foreign states may be displayed near governmental institutions of the Republic of Lithuania only during official visits, official ceremonies and international events according to the order established by the diplomatic protocol and international documents. The flags of foreign states may be displayed only near the institutions of foreign states, which are legally established in the Republic of Lithuania.
When the Lithuanian State Flag is displayed together with the flag of another state, the Lithuanian State Flag must be displayed, when facing the facade of a building, on the right side and the flag of another state - on the left side. If the flags of several states are displayed together with the Lithuanian State Flag, they shall be displayed to the left and to the right from the Lithuanian State Flag. If the number of the flags of other states displayed together with the Lithuanian State Flag is even, they shall be alphabetically displayed in equal number on both sides of the Lithuanian State Flag. The Lithuanian State Flag must be displayed on the same level with the flags of other states. When the Lithuanian State Flag is displayed on a means of transportation (except ships), it shall be clamped to the left fender and the flag of another state shall be clamped to the right fender.
On the days of mourning, in accordance with the resolution of the Presidium of the Supreme Council of the Republic of Lithuania the Lithuanian State Flag may be displayed with a mark of mourning, that is attaching a 10 centimetres wide black ribbon to the staff or pole, so that the ends of the ribbon shall reach the bottom of the flag. If on the days of mourning the Lithuanian State Flag is displayed from the pole, the flag shall be lowered to one-third of the length of the pole.
The Lithuanian State Flag may be displayed on other holidays and memorable days, as well as on the occasion of public events. The citizens of Lithuania may display the Lithuanian State Flag near their place of residence during the personal celebrations, and the citizens of foreign states residing in Lithuania may display the flags of their states.
The displayed Lithuanian State Flags must be in good shape and not faded. When the flags are displayed near buildings, the flags shall be set into the holders which are fixed on the facade of a building so that an angle between the staff of the flag and the facade shall not be greater than 45 degrees. The lower part of the holders shall be fixed on the facade not higher than 2 metres from the ground. The Lithuanian State Flags may be displayed on the poles established in front of the facade of a building.
The likeness of the Lithuanian State Flag shall be on airplanes registered in the Republic of Lithuania.
The likeness of the Lithuanian State Flag may be used as the state and national symbol for decoration in general so that no disrespect shall be shown to the Lithuanian State Flag.
The responsibility for the implementation of these regulations while displaying the Lithuanian State Flag near the buildings of the state power and governmental bodies, enterprises, institutions and organizations, shall fall with their administrative heads, and while displaying the flag near dwelling houses, the responsibility for the implementation of these regulations shall fall with their owners and officials, who are charged with the organizing of the exploitation of dwelling houses.
The boards of local governments shall be charged with the supervision of accurate implementation of this Law. Charged with the supervision of accurate implementation of this Law in national defence units shall be the Department of National Defence, in self-propelled ships - captains, in non self-propelled ships - skippers, in harbours and wharfs of the Republic of Lithuania - harbour-masters, in diplomatic and trade missions, as well as in consular institutions - their heads.
The manufacture and sale of the Lithuanian State Flag shall be carried out in accordance with procedure established by the Government of the Republic of Lithuania.
The citizens of the Republic of Lithuania as well as other persons who are staying in Lithuania, must respect the Lithuanian State Flag. The outrage upon the Lithuanian State Flag shall be punishable in accordance with the procedure established by laws of the Republic of Lithuania.
I don't quite follow this - are the black-ribonning and half-masting two mutually excludable procedures one may employ for expressing mourning, or are they both done in the same time - i.e. are the half- masted (actually 2/3-masted) flags also ribboned?
I'd say that one would be proceidure for "indoor" flags and the other for masted flags, but I don't quite read it that way from the text.

References: Art. 1

Art. 2

Art. 3

Art. 4

Art. 5

Art. 6

Art. 8

Art. 9

Art. 10

Art. 11

Art. 12

Art. 13

Art. 14

Art. 15