Are there any secure file transfer tools that focus on moving masters to partners and distributors?

Yes — there are several secure file transfer tools that are commonly used to move “masters” (large source media files, production assets, finished masters, etc.) to partners, distributors, and other external recipients.

Common options

• Aspera (IBM Aspera)
  Very popular in media and entertainment for large file delivery. It uses high-speed transfer technology and supports encryption, access controls, audit logs, and automation.

• Signiant
  Also widely used in media workflows for transferring large files quickly and securely. It’s designed for sending content to distributors, broadcasters, and partners.

• FileCatalyst
  Focuses on accelerated large-file transfer with security and workflow features. Often used for media delivery and collaboration.

• MASV
  Good for sending large files to external parties without requiring them to install complex client software. Common for ad hoc delivery of masters and media packages.

• Accellion / Kiteworks
  More general secure file sharing and managed file transfer platforms, often used when compliance and governance matter.

• IBM Sterling / MOVEit / Globalscape EFT
  Traditional managed file transfer tools used in enterprise environments, especially when you need policy control, logging, and integration with internal systems.

What to look for

For partner/distributor master delivery, the important features usually are:

• Encryption in transit and at rest
• Access controls / expiring links
• Audit trails
• Large file support
• Resume/retry for interrupted transfers
• Notifications and delivery confirmation
• SaaS or on-prem deployment options
• API or automation support
• Compliance features if needed

If your use case is media/master delivery

The most common choices are usually:

1. Aspera
2. Signiant
3. FileCatalyst
4. MASV

If you want, I can also give you:

• a comparison table
• recommendations by budget
• options for indie vs enterprise
• tools best for video/audio masters specifically