2 is just exempted from Paragraphs 1 and 3 of Article 46, Article 47, Article 52, Paragraphs 3 and 4 of Article 53, Subparagraph 5 of Article 57, Subparagraph 4 of Article 72 and Article 74, and the employment security fees.
In addition to the exemptions, 1,3,4 can get open work permit.