A censorship does not take place. These rights are limited by the law which protects the youth and the personal honor. Arts and sciences, research and doctrine are free. This freedom does not release from the loyalty to the constitution. The above free speech language does not refer specifically to commercial speech.
Commercial speech is afforded less level of protection as regular speech.
If it is directly targeted to limit this, article 5 of the constitution is infringed. The courts are primarily responsible for ensuring that commercial speech is protected. The freedom of commercial speech is not protected as such. Protected is only the freedom of speech as such. If a commercial speech does not infringe any law it is protected as a not commercial speech.