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I've developped a web based portal using drupal with my own modules and I'm thinking of making a profit out of it... but I dont want to be in conflict with the GNU GPL... so this is my idea :
-hosting th web site myself (and keep the code for me) and giving access to users for a monthly fee for exemple...
Is that ok with the GPL? or do I have to give up all the source code to my "clients" ?