6. Does ACS assign a license or claim copyright for data submitted to ACS Research Data Center?

No; because we do not store the files, they are not subject to any license or copyright transfer. However, if you submit the files to be posted or published at another venue, such as a preprint server or journal, the files may be subject to license or copyright terms there. Please consult the journal or preprint server you intend to submit your data to for more information.