text message
Definition:
A text message is a short (160 characters or less) message sent between two mobile phones. Text messaging is available on most digital mobile phones but depending on your calling plan you may incur additional per message charges to send and receive text messages.
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DRM
DRM stands for Digital Rights Management and is a term used to describe restrictions placed on digital media such as music and movies. The intent of the restrictions is to prevent copying or otherwise illegal distribution of the digital media. Apple initially sold all of the music in its iTunes library with DRM but have recently relaxed that restriction and now sells a subset of their catalog DRM-free.
