Do clients need rulesets installed

[Kagesh]

This is a real basic question but I can't seem to find an answer for it. If I were to purchase and install a Ruleset, say the Call of Cthulhu one, and want to run a campaign, do my players (clients) also need to purchase and install the ruleset?

Thanks,
Mark

[Sorontar]

This is a real basic question but I can't seem to find an answer for it. If I were to purchase and install a Ruleset, say the Call of Cthulhu one, and want to run a campaign, do my players (clients) also need to purchase and install the ruleset?

Thanks,
Mark

No they don't.

[Kagesh]

Thanks!

Mark