[adrianN]

From the same site:

"The original copyright holder retains: [...] The right to post author-prepared versions of the work covered by ACM copyright in a personal collection on their own Home Page and on a publicly accessible server of their employer, and in a repository legally mandated by the agency funding the research on which the Work is based. Such posting is limited to noncommercial access and personal use by others, and must include this notice both embedded within the full text file and in the accompanying citation display as well:

"© ACM, YYYY. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in PUBLICATION, {VOL#, ISS#, (DATE)} http://doi.acm.org/10.1145/nnnnnn.nnnnnn

[gcb]

You own the paper. You can publish it on your personal site before X in "© acm 200x". It's not your fault they didn't choose to take interest in the paper before that date...