The OpenAIRE Graph is freely available for download and re-use under CC-BY licensing. This is because some of the inputs in the Graph are licensed under this category. Some input sources of the Graph (e.g., OpenCitations) provide their data using CC0, hence these respective Graph contents (e.g., citations coming from OpenCitations) can be downloaded from the original sources with this license.
Please examine the licensing of the Graph sources to investigate this option.