| 摘要 |
A public version of content includes information to access a private version. The private version is typically of higher value, as it is a complete version and/or of higher audio or video quality than the public version. The public version can be shared or played without restriction, which enables the content to be promoted, yet provides an incentive for the user to access the private version. The public version can include information that enables a user to obtain software necessary to get the private version. In addition, the public version can include a digital watermark used to access the private version.
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