The ACM Digital Library Crossmark Policy

Crossmark is a multipublisher initiative to provide a standard way for readers to locate the current version of a published work. By applying the Crossmark button, ACM is committing to maintaining the content it publishes, and to alerting readers to changes if and when they occur.

Clicking the Crossmark logo on a document will tell you its current status and may also give you additional publication-record information about the document. If an update exists, the status information will include a Crossref DOI link to the updated document and any associated documents such as Errata, Expressions of Concern, and Retractions.

For more information on Crossmark, please visit the Crossmark site.

For general author guidelines and information on publication policies, please visit ACM Publications Policies and Procedures page. More specifically, policies regarding Withdrawal, Correction, Retraction, and Removal of Works, are detailed in https://www.acm.org/publications/policies/retraction-policy page.