Sharing copyrighted content in a peer-to-peer (P2P) network involves multiple legal and technical considerations. Under the premise of complying with relevant laws and regulations, the following encryption technologies can be used to enhance the security of content sharing: 1. **End-to-end encryption**: Ensure that files are encrypted during transmission between the sender and the receiver. This prevents interception and unauthorized access. Common encryption algorithms include AES (Advanced Encryption Standard). 2. **Encrypted file storage**: Files stored on network nodes can be stored encrypted, that is, only those with the correct key can decrypt and access these files. 3. **Digital Rights Management (DRM)**: Use DRM technology to control the use rights of content. DRM can limit the number of copies, playback times and time of files. 4. **Digital Signature**: Add a digital signature to the file to ensure the source and integrity of the file and prevent tampering. Digital signatures are usually implemented using public key infrastructure (PKI). 5. **Sliced storage and transmission**: Divide the file into several encrypted small pieces, which are transmitted and stored on multiple nodes respectively. This can improve both security and transmission efficiency. 6. **Virtual Private Network (VPN)**: Use VPN technology to hide the user's IP address and their activities on the network, increasing anonymity and security. 7. **Zero-knowledge proof**: Through zero-knowledge proof technology, it is possible to verify the authenticity of a party's possession of a certain information without revealing the specific content of the information. When implementing the above technologies, it is important to ensure that all technical measures are compliant and respect the copyright of the content and relevant laws and regulations. Unauthorized sharing or use of copyrighted content may result in legal liability.