This includes:
* The right to reuse any portion of the Work, without fee, in future works of the Author’s (or Author’s Employer’s) own, including books, lectures and presentations in all media, provided that the ACM citation, notice of the Copyright and the ACM DOI are included ...
* The right to revise the work.
What is a typical copyright notice for conferences you *do* publish in? What rights do you need?
In computer science, typically a journal publication arising in part from a conference paper would include new results, or several papers would be combined.
-Jodi