When raising a flag to be flown at half-staff, it should first be raised to the top of the pole and then lowered to a point where the distance between the top of the flag and the top of the pole is one third of the length of the pole. When lowering the flag from half-staff, it should first be raised to the peak of the pole before it is lowered. The Regional Flag and Regional Emblem Ordinance states what manner of use of the Hong Kong flag is prohibited and that desecration of the flag is prohibited; it also states that it is a punishable offence for a person to use the flag in a prohibited manner or desecrate the flag. According to the ordinance, a flag may not be used in advertisements or trademarks, and that "publicly and wilfully burning, mutilating, scrawling on, defiling or trampling" the flag is considered flag desecration. Similarly, the National Flag and National Emblem Ordinance extends the same prohibition toward the national PRC flag. The ordinances also allow for the Chief Executive to make stipulations regarding the use of the flag. In stipulations made in 1997, the Chief Executive further specified that the use of the flag in "any trade, calling or profession, or the logo, seal or badge of any non-governmental organisation" is also prohibited unless prior permission was obtained. The first conviction of flag desecration occurred in 1999. Protesters Ng Kung Siu and Lee Kin Yun wrote the word "Shame" on both the national PRC flag and the Hong Kong flag, and were convicted of violating the National Flag and National Emblem Ordinance and the Regional Flag and Regional Emblem Ordinance. The Court of Appeal overturned the verdict, ruling that the ordinances were unnecessary restrictions on the freedom of expression and in violation of both the Basic Law and the International Covenant on Civil and Political Rights. Upon further appeal, however, the Court of Final Appeal maintained the original guilty verdict, holding that this restriction on the freedom of expression was justifiable in that the protection of the flags played a role in national unity and territorial integrity and constituted a restriction on the mode of expressing one's message but did not interfere with one's freedom to express the same message in other ways. Leung Kwok-hung, a former member of the Legislative Council and a political activist in Hong Kong, was penalised in February 2001, before he became a member of the Legislative Council, for defiling the flag. He was convicted of three counts of desecrating the flag—for two incidents on 1 July 2000 during the third anniversary of Hong Kong's handover to China and for one incident on 9 July of the same year during a protest against elections to choose the Election Committee, the electoral college which chooses the Chief Executive of Hong Kong.