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HERITAGE

Built on day one. Rebuilt for today.

1999
Brent Rector starts writing Demeanor against internal Microsoft "Lightning" builds — before Microsoft publicly announces .NET.
June 2000
Wise Owl announces Demeanor and ships the first beta alongside .NET Beta 1. The first .NET obfuscator.
Feb 2002
.NET Framework 1.0 ships. Demeanor is already a mature, production-shipping product on day one.
2003–2020
Wise Owl keeps Demeanor current through every .NET generation. Red Gate Software — a long-time Demeanor customer — approaches Wise Owl about acquiring Demeanor for their developer-tools portfolio. Wise Owl's founder, appreciating the vote of confidence, declines the offer. Red Gate then buys SmartAssembly as their alternative.
2021
Brent rips out per-seat phone-home licensing and replaces it with per-company self-validating keys — no activation server, no machine locking, no seat counting.
2025–26
Brent ships the complete ground-up rewrite. Modern C# 14, .NET 10, one NuGet package with Windows, Linux, and Mac binaries.
CONTINUITY

One product. One vendor. One engineering hand. 26 years.

Other products in this market come and go — they get acquired, rolled into private-equity brand umbrellas, hand-offs to new owners, transition from free to paid mid-life, or go dormant for years at a stretch. Demeanor has done none of those things. It is the original .NET obfuscator, and it is still owned, maintained, and shipped by the person who wrote the first beta in June 2000.

Demeanor for .NET
1999 → today
  • Owner: Wise Owl Software (unchanged)
  • Developer: Brent Rector (original, unchanged)
  • Acquisitions: None
  • Brand changes: None
  • Free-to-paid transitions: None
  • Dormant periods: None
Dotfuscator (PreEmptive)
2003 → today
  • Acquired by Idera, March 2021
  • Rolled into Sembi brand umbrella, January 2025
  • Now sits three corporate layers above the customer
SmartAssembly
2005 → today
  • Independent studio until 2009–2011
  • Acquired by Red Gate Software
  • Not listed among Red Gate's strategic products in 2026
Eazfuscator.NET
2008 → today
  • Free personal project, 2008–2012
  • Commercialised under Gapotchenko in 2012
  • Free-to-paid transition mid-lifecycle

For a buyer whose procurement window extends past the next vendor acquisition cycle — i.e. someone who wants the vendor on their PO today to still exist, unchanged, when they sign a renewal in 2030 — continuity of ownership is a signal worth reading. It is the cleanest commercial-continuity record in this market and it is not one any other commercial .NET obfuscator can match.

THE AUTHOR

Brent Rector

Photo of Brent Rector, author of Demeanor for .NET

Brent Rector wrote Demeanor, the original .NET obfuscator, and has shipped it continuously under the Wise Owl Software name for twenty-six years.

Brent's career spans five decades — mainframes, minis, PCs, cloud, and AI — and nearly twenty of those years sit inside Microsoft, where he worked as a Principal Software Architect. A full decade of that Microsoft tenure he spent working directly on the Windows operating system itself; he spent the remainder on Microsoft's developer-tooling side — Visual Studio, the Windows SDK, and .NET itself. Between those two decade-long arcs there is essentially no layer of the Windows-and-.NET stack he has not worked on from the inside of the platform. When you buy Demeanor you are buying a tool whose author helped build the platform it runs on and the developer tools you use to build against that platform.

Brent also authored multiple Microsoft Press titles on Windows internals and served as an early Microsoft Regional Director. He runs Wise Owl Software out of San Diego, California.

Demeanor v6 is a complete ground-up rewrite in modern C# 14 targeting .NET 10 — designed to be the most correct, transparent, and developer-friendly obfuscator on the market.

Protect your .NET code with 25 years of expertise

One NuGet package. One MSBuild property. Zero config.

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