AKA: Dual-Licensing, Multi-Licensing, Hybrid licensing,Resticted License, Proprietary Licences, License Exceptions
Different licenses forcing commercial users to pay a license fee to the open source project. Enables recurring payments often with support guarantees or SLAs.
Requires:
Variants & Options:
| Characteristics | Value | Note | 
|---|---|---|
| Effort to set-up | Weeks | Creation of a commercial license and legal documents | 
| Effort to maintain | Low | Maybe reminders that commercial use is needed | 
| Cost to set-up | Medium | Will require a lawyer to setup the license and contracts | 
| Cost to maintain | Low | Will cause costs for legal or tax related stuff (but should be covered by income) | 
| One-time Income | High | Few companies might pay large amounts if the OSS is essential | 
| Recurring Income | High | License can enforce recurring payments per month or year | 
| Income Predictability | High | Companies probably need OSS for several years | 
| Full income Threshold | 10+ | Â | 
| Recipient | C | Â | 
| Additional Work | Medium | Will cause communication and SLA related work | 
| Visibility | Medium | Easy to overlook but should stand out in a tech due dilligence | 
| Necessity to pay | High | However, companies might look for other solutions | 
| Entry Threshold | Medium | Individual contracts between every OSS and company might be necessary | 
| Countervalue | None | Legal commercial use | 
| Scalability | Medium | Scales with the number of commercial users (who must pay) | 
| Effort for marketing | Low | Â | 
| Competitors | O | Depends on the original OSS licence: other companies could fork and develop it further with a proprietary license. | 
| Software types | Special | Best for libraries or programs companies build tools upon | 
NOTE: A CLA (Contributor License Agreement) may be required to accept code contributions from third parties to the source code while retaining the ability to dual-license those contributions under the proprietary license.