We are currently in the process of creating a service that records video (in this case in a non-profit tennis court) of the people at the location practicing and/or playing. This is not meant for or used in any way for security or surveillance purposes but the videos are meant to be sold back to the person/people playing or training. This would make for much higher quality video than simply having a friend record your game with their smartphone and wouldn't even need a friend to be there.
We have the owners permission to set up cameras. The question is: how legal is this?
We are in Sweden.