[FedML-HE] How is the merging of decrypted weights done?

Hello, I have two questions concerning FedML-HE:

My first question is about the **Threshold-Key Management** protocol that you presented in the Appendix of the paper. You mentioned that the participants partially-decrypt the aggregated parameters and **merge** the results to obtain the result in plaintext. Would you please explain to me how the merging is done? Do each participant send the weights he decrypted to the other participants so that each one of them can merge the weights locally?

My other question is regarding the Homomorphic operations done by the Aggregator, is it a **Fully-Homomorphic Encryption** (homomorphic addition and multiplication)?

Thank you