I am trying to develop a retrieval system for which a corpus is required. Since PubMed hosts many free articles, I decided to use it. However, now I found out that PubMed central has licensing restrictions.
Since my intention is to release the corpus formally along with my software (which obviously is not related to biology and I am not using the publications scientifically), I believe that any license will do. However, I don't want to take any chances. Can anyone tell me which license to use in PubMed?