2. It should be possible to define laws that forbid to copy. I'm fine with sharing my data at a particular moment for a particular purpose. If that party would be forbidden to copy that data I have a chance that I actually can "have the right to be forgotten". Every time a person requires that data it would need to do another request. This is kind of the idea behind https://www.qiyfoundation.org/ (based on blockchain, but that's irrelevant here).
Personally I think of three lines of attack:
1. I own my data and should be able to sell my data. For all kind of reasons. Sometimes sharing data will protect my privacy! https://www.linkedin.com/pulse/evil-postman-anne-van-rossum?...
2. It should be possible to define laws that forbid to copy. I'm fine with sharing my data at a particular moment for a particular purpose. If that party would be forbidden to copy that data I have a chance that I actually can "have the right to be forgotten". Every time a person requires that data it would need to do another request. This is kind of the idea behind https://www.qiyfoundation.org/ (based on blockchain, but that's irrelevant here).
3. My ideal scenario is not having unencrypted data at all: homomorphic encryption, see https://en.wikipedia.org/wiki/Homomorphic_encryption.