HarperCollins recent decision to restrict library eBook checkouts has inspired a growing protest over DRM.
Digital Restrictions Management is a type of security placed on files to control how you use them. The goal of DRM is to piracy, but given how easy it is to remove DRM from ebooks, it has largely failed in that goal.
DRM is the tool that HarperCollins uses to enforce its new rule. Naturally this has brought more attention to an unpopular technology, and given heart to its protesters.
The artist Ninay Paley has made a number of simple icons so you can show how you feel about DRM. You can find them at readersbillofrights.info