Yes, all the data available on the Cabildo de Tenerife Open Data Portal is free and can be reused freely, always respecting the conditions indicated by each license.
In the case of the Cabildo de Tenerife Open Data Portal, the Creative Commons Zero license will generally be applied to the Cabildo de Tenerife datasets, which means that in this case the data is belonging to the public domain and without restrictions. The application license can be consulted for each set of the collection.
For more information on licensing, visit the Creative Commons website and the Open Data Commons website.