First, for legal advise, always consult a lawyer. Even if there's a lawyer responding, they're not your lawyer.

Second, check if the site has a EULA or so. If crawling is against the EULA, you might be guilty under the Computer Fraud and Abuse Act (penalties for this can be pretty severe).

Third, data itself is not copyright-able, so in theory it could all work out.

IANAL, this is not legal advise.