Is it allowed or copyright issue to recreate a purchased softback module in Roll20 for a campaign?

You're generally free to do what you want in personal games :) Within reason of course. For your stated case, that's no problem at all. We really prefer to stay out of things unless it brings legal risk upon us or is blatantly ripping off creators.So long as your LFG posts aren't something like "Come join my game where you can download all of these Dragonlance book scans for FREE lol", you're pretty golden! Enjoy!

Same rules. If you've purchased the content legally (from us or elsewhere), you're free to run it with any group you'd like. Private agreements between involved parties about who GMs and why is between you, same as it would at your kitchen / cafe / convention table. Common use scenarios are all fine. Things only start to get abusive once content is being copied or exported to non-owners, or for non-common use scenarios such as making a game in order to invite dozens of users in to be able to grab the content in order to avoid supporting the creator. It's extremely rare for there to be a problem in common use play scenarios, and they are generally quite obvious if there are. If you ever feel you're entering territory that's edging on abusing a creators rights, feel free to reach out to <a href="mailto:team@roll20.net" rel="nofollow">team@roll20.net</a> as well for guidance or assurance :)