Hash-based Counter Scheme for Digital Rights Management. - Mikko Löytynoja; Tapio Seppänen (ICME, 2005)

Watermark-based Counter for Restricting Digital Audio Consumption. - Mikko Löytynoja; Nedeljko Cvejic; Tapio Seppänen (IEC (Prague), 2005)

Mobile DRM-Enabled Multimedia Platform for Peer-to-Peer Applications. - Mikko Löytynoja; Timo Koskela 001; Marko Brockman; Tapio Seppänen (ISM, 2006)