摘要:
A method of encrypting a motion picture file and a method of digital rights management using the same, wherein encryption method includes: extracting information on the location of at least one video sample, which is a real-time streaming unit, from meta-data of the motion picture file; extracting the video samples based on the location information; encrypting the extracted video samples, excluding a start code within a video sample header of each extracted video sample, based on predetermined encryption information; and producing an encrypted motion picture file by recombining the encrypted video samples. Since the file is encrypted in units of video object planes (VOPs) while maintaining an MEPG-4 file format, the encryption method can be easily applied to a completed file format and streaming service is also possible.
摘要:
The present invention relates to novel aminopeptidase derived from Bacillus licheniformis, a gene encoding the aminopeptidase, an expression vector containing the gene, a cell transformant transfected with the expression vector and a process for preparing a natural type protein using thereof. More particularly, the present invention relates to a gene encoding aminopeptidase which is cloned and manufactured using the recombinant DNA technique, an expression vector containing the gene, a cell transformant transfected with the expression vector and a recombinant aminopeptidase which is necessary to produce recombinant human growth hormone in a natural type protein and can be expressed in a high yield more stably and advantageously, compared with conventional methods for the purification.
摘要:
A method of encrypting a motion picture file and a method of digital rights management using the same, wherein encryption method includes: extracting information on the location of at least one video sample, which is a real-time streaming unit, from meta-data of the motion picture file; extracting the video samples based on the location information; encrypting the extracted video samples, excluding a start code within a video sample header of each extracted video sample, based on predetermined encryption information; and producing an encrypted motion picture file by recombining the encrypted video samples. Since the file is encrypted in units of video object planes (VOPs) while maintaining an MEPG-4 file format, the encryption method can be easily applied to a completed file format and streaming service is also possible.