aspectweb.org software annoQ
  Sign-On  
The sign-on mechanism is currently NOT intended for access control. It allows, if required, user-centric data grouping operations and provides a trustworthy author identification. Published data is freely accessible to everyone.
For convenience, first data request will auto-generate an identification token to be stored as cookie for future reuse, if desired. This is what we call the fingerprint based sign-on (browser dependent). The sign-off action will destroy current identity.
For tracing regular data-cluster activity the user has the possibility to sign-on using an openID based identity.
Eg. nickname.myopenid.com