I have multiple Atlassian Applications (Jira, Confluence, Bitbucket) and would like to use your SAML Plugin on each one of them. Do I have to purchase a plugin license for every one of my Applications?


In short: Yes.

The way that Atlassian's Marketplace licensing works are that you essentially need a separate plugin license for every Atlassian host system. Generally, these licenses have to match (or exceed) the base User license of the Atlassian Application and are based on the same User tier steps (or remote Agents on Bamboo).
We sell our Plugin exclusively via the Atlassian Marketplace, which makes the purchase process very simple in line with how you purchase your Atlassian Applications, but it also means we have not to adopt the exact licensing scheme that Atlassian prescribes for all Plugins.

Some further reading: