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A comment on Ask HN: Ideas for offering a free trial without users abusing it?.
- Hash each pdf, check if it’s been run for free before
- Hash IP addresses, check before allowing free trial (can lead to many false positives though)
- Use local storage or cookies to detect if they’ve done the trial or not (easily circumvented, but not by general users)
Probably a combination of a few of these would give what you want
- Hash each pdf, check if it’s been run for free before
- Hash IP addresses, check before allowing free trial (can lead to many false positives though)
- Use local storage or cookies to detect if they’ve done the trial or not (easily circumvented, but not by general users)
Probably a combination of a few of these would give what you want