You can check the GENERAL CONTRACTING CONDITIONS here. To answer your question, we present you with an extract of these conditions regarding intellectual property rights:
“LOWPOST, S.L. transfers the rights of reproduction, distribution, public disclosure, exploitation, and transformation, in the terms and conditions established in this contract. The previous rights will be on the texts that LOWPOST, S.L. delivers to the Client, under Royal Legislative Decree 1/1996, of April 12, which approves the Consolidated Text of the Spanish Law on Intellectual Property. The transfer of the rights will be exclusive to the Client, and LOWPOST, S.L. undertakes not to publish the same text in an identical way elsewhere.
Likewise, the Client undertakes to make use of the contents following the current legislation on Intellectual Property.”