TagCaptcha: Annotating images with CAPTCHAs

Bibtex entry :

@inproceedings { morrison2010:ACM-MM,
    author = { Donn Morrison and Eric Bruno and St{\'e}phane Marchand-Maillet },
    title = { TagCaptcha: Annotating images with CAPTCHAs },
    booktitle = { ACM MULTIMEDIA 2010 (Demo Program) },
    url = { http://viper.unige.ch/documents/pdf/morrison2010-tagcaptcha.pdf },
    address = { Firenze, Italy },
    month = { October 25 },
    year = { 2010 },
}
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