What about the security of personal data which I provided to a cannabis club?
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The answer to your questions is that the personal information is confidential which is completely safe and will not be shared with any one, so no worries!!
It seems that you are newbie and do not have much information. So joining the cannabis club can be a little difficult for you. As the Barcelona did not allow foreigners to go for cannabis clubs, so you must have a proper membership for it.
I will recommend you to take the services of High Times Barcelona which are doing great efforts for beginners and guide them greatly. I have also taken their services previously and a lot of other people are also taking benefits from them. In short, they are best for the people who don't have knowledge about joining of cannabis club.
Get in touch with them and you will get the answer of your queries.