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Encrypting two messages with the same content with different keys/IVs still secure if attacker knows they are the same?

Yes, that should be secure as long as each algorithm is CPA-secure (as AES, Chacha20 and Serpent should be), and the keys are chosen independently and uniformly at random (different keys is not enough)...
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Faster cipher than AES256-CBC to use for DRM purpose

If you are writing your own implementation of AES, and can use the AES-NI instruction set, then you will end up with a cipher that is mathematically secure and fast. Very fast... AES in hardware is ...
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Benchmark for CSPRNG as stream ciphers?

The ChaCha20 cipher works at > 80 MiB/s on a single CPU core, so a modern GPU with hundreds or thousands of execution units would achieve the required performance of 100 Gbps. This is theoretically ...
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Faster cipher than AES256-CBC to use for DRM purpose

Try OpenSSL. It has assembly language routines which take advantage of CPU specific instructions that are intended to speed up AES. The assembly routines do have to be enabled when building OpenSSL. ...
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