30Consequently, the legislation at issue in the main proceedings concerns levies allocated specifically and directly to the funding of social security. That legislation therefore has a direct and sufficiently relevant link to the laws which govern the branches of social security listed in Article 3 of Regulation No 883/2004 and thus comes within the scope of that regulation (see, to that effect, judgment of 26 February 2015, de Ruyter, C‑623/13, EU:C:2015:123, paragraph 27 and the case-law cited). The dispute in the main proceedings thus concerns a possible restriction on the freedom of movement for workers as a result of a social security measure which forms an integral part of the national social security system.
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