Implementation of Secondary Available Digital Content Protection Schemes using Identity-based Signatures

User generated content (UGC) is widespread, wherein general consumers utilize the Internet to generate content files. Using this service, content files can be easily created and uploaded. However, copyright is often not protected on the Internet. An activity known as a creative commons license enables authors to manage the secondary use of original content files. However, this license cannot prevent malicious editors from using the original files. Therefore, we propose technical protection measures using the creative commons license and identity-based signature, wherein authors apply identity-based signatures to content files that need to be protected. By verifying the signature, malicious edits performed on the files can be detected. We investigated the processing speed required for this via simulation and used the 3DCG movie editing tool "Miku Miku Dance" as the content files.