The Legal Environment for Copyright Protection and Trust Management in China
This paper surveys the legal and regulatory environment surrounding copyright protection technologies, focusing on China in particular. The paper begins with a discussion of some of the interactions between law and technology in copyright protection, which has led to the creation of international treaties to protect the technologies that protect copyrights. A comparison of the various national responses to these conventions is presented, followed by a discussion of the structure and development of the relatively advanced Chinese system for copyright protection technology. The last section outlines some of the unique challenges that have arisen in China for copyright protection technologies and the businesses that depend upon them.
DRM Licensing Design for Interactive Rebuilding of DTV in China
Digital Rights Management (DRM) is an efficient method to protect digital content in various applications such as Digital TV, IPTV, Video on Demand, etc. In China, the legal and administration systems, business models and industrial chain are different from those of other countries and therefore have special requirements on DRM technologies. In this paper, we propose a new licensing design to extend the classic DRM architecture where the new system takes into account the commercial integrity, central monitoring, and potential user scalability. We propose a licensing method of secure audit report and Mass-License, with architecture of linked License Portals and License Issuers as basic insurance. The extension does not impact on the security of former DRM systems, and is compatible with the PKI-based trust model.
LABORATORY AND FIELD TESTING OF SEED SPACING UNIFORMITY FOR SUGARBEET PLANTERS
Five planter configurations were evaluated for seed spacing uniformity at three field speeds using a seed 
location method in the field and a laboratory method involving an opto-electronic sensor system. Planter seed spacing 
uniformity was described using the Coefficient of Precision (CP3) measure. Results showed that CP3 measures 
determined using the laboratory test method were significantly different from those determined using the field test method. 
This indicated the laboratory test method cannot be used to predict planter seed spacing uniformity in the field. Seed 
spacing uniformity determined in laboratory tests was higher than, or equal to, seed spacing uniformity determined in 
field tests. This indicated the laboratory test method may be useful to screen out planters or planter units with poor 
uniformity of seed metering. Field testing of the planters that perform well in laboratory tests must be conducted to 
adequately determine the seed spacing uniformity of those planters in the field. Results from laboratory and field tests 
could be useful in determining areas for improvement of planters or planter units.