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>" [...] they are correct [...] " //

Is this your legal opinion or a moral judgement.

IMO, and in the opinion it seems of Brazilian copyright law (see my other comment), copying information should be excluded from the monopolistic protection given to artistic works.

Presenting information that has been given away freely (gratis) is alternative forms seems pretty harmless. Here especially as the compilation of the information has been paid for, in some way, by the pupils families (or communities if supported by taxes) and the re-use of the information is for those pupils. Yes, the OP is charging for the app, but then no-one need buy it if they find that the new presentation of the information is not worth the price asked.