(WSchG, SR 232.21) of 2013 (in force since 2017). This law replaced the flag law 1931 (last revised 2008). The 2013 law for the first time defines both the Swiss flag and the Swiss coat of arms based on an image, declared as authoritative in the text. Use in Switzerland Private use The flag is flown around the year from private and commercial buildings as a display of patriotism, particularly in rural areas and often together with the cantonal and municipal flag. On Swiss National Day, 1 August, the streets and buildings are traditionally festooned in celebration with Swiss flags and banners. Prominent display of the Swiss flag on clothing and apparel has become more frequent with the "Swissness" fashion trend in the first decade of the 21st century, while such use of the flag had previously been largely limited to conservative and right-wing circles. The flag and coat of arms are also often used (frequently in contravention of federal law, see below) as design elements on merchandise, particularly on high-quality goods or on merchandise aimed at tourists; for example, the emblems of Victorinox and Wenger, manufacturers of Swiss Army knives and the sole purveyors of these knives to the Swiss army, are based on the Swiss coat of arms. Official use The display of the flag on federal, cantonal and municipal public buildings follows no uniform pattern or regulation. Many public buildings are equipped with flag posts (most often one each for the federal, cantonal and municipal flag), but the flag(s) may only be flown during part of the year or only on National Day. In Bern, the flag is flown on the cupola of the Federal Palace while the Federal Assembly is in session. Legal protection Destruction, removal or desecration of a Swiss, cantonal or municipal flag or coat of arms that has been installed by a public authority is punishable by a monetary penalty or imprisonment of up to three years according to the federal penal code. The commercial use of the Swiss cross, Swiss flag or Swiss coat of arms was technically prohibited by the 1931 Federal Act for the protection of public coats of arms and other public insignia, but that prohibition was not enforced. Increasing commercial use of the Swiss coat of arms prompted a number of federal regulations, dubbed "Swissness regulation" (Swissness-Verordnung), in force since 2017. The "Coat of Arms Protection Act" of