Software License Agreements: What Developers and Buyers Both Need to Know

License vs. Sale: Why You Don't "Own" Software

When you buy software, you don't own it — you license it. The software company retains ownership; you receive a limited right to use it under specific conditions. Understanding those conditions matters whether you're a developer licensing your product or a business buying software for your team.

Key License Types

Perpetual License

Pay once, use forever. Common in traditional desktop software. The license doesn't expire, but support and updates typically do after a maintenance period. Risk for the buyer: you're locked into a version that may become obsolete. Risk for the seller: one-time revenue model.

Subscription (SaaS) License

Pay monthly or annually for continuous access. Software hosted by the vendor. Subscription ends → access ends. Buyers need to plan for data portability: what happens to your data if you stop paying or the vendor shuts down?

Open Source

Source code is available, but the license determines what you can do with it. Key variants:

MIT/Apache 2.0: Very permissive. Use, modify, distribute freely. Include copyright notice.
GPL (copyleft): If you distribute software that includes GPL code, your software must also be open source under GPL. Cannot use GPL components in proprietary software.
LGPL: More permissive than GPL — can link to LGPL libraries from proprietary software without triggering copyleft.
AGPL: Strongest copyleft — even SaaS using AGPL code must open-source their application.

Critical Clauses for SaaS Agreements

Usage Restrictions

What are you prohibited from doing? Common restrictions: no reverse engineering, no competitive benchmarking, no exceeding user seat limits, no use in prohibited jurisdictions. Violations can terminate the license immediately.

Data Ownership and Portability

Who owns the data you put into the software? Standard answer: you do. But some agreements grant the vendor license to use your data for product improvement or analytics — sometimes in anonymized form, sometimes not. Read carefully, especially for sensitive business data.

Data portability: can you export all your data in a usable format? What happens to your data 30/60/90 days after account termination? Get this in writing.

Service Level Agreement (SLA)

For SaaS: guaranteed uptime (typically 99.9% = ~8.7 hours downtime/year), response times for support tickets, and remedies for SLA breaches (usually service credits, not refunds). Understand the financial cap on remedies — it's almost always insufficient to cover actual business losses from outages.

Security and Compliance

For software handling regulated data (healthcare: HIPAA, payments: PCI-DSS, EU users: GDPR): is the vendor willing to sign a Business Associate Agreement (BAA)? Is their security posture auditable (SOC 2 Type II)? These aren't optional if you have compliance obligations.

Termination and Transition

How much notice is required to terminate? What's the process for data export? Is there a transition assistance period? For mission-critical software, 30 days' notice with immediate data access cutoff can be catastrophic. Negotiate 90 days minimum and guaranteed data export for at least 90 days post-termination.

For Software Developers: Licensing Your Product

Key decisions when licensing your software:

Define "authorized users" precisely — per seat, per named user, or concurrent users?
Restrict competitive use explicitly if you don't want competitors using your product for benchmarking
Include audit rights — the right to verify customer license compliance
Specify what constitutes acceptable use and prohibited use
Address AI training explicitly: do you permit or prohibit use of customer data to train ML models?

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