dotnet/Documentation/compatibility/system_activities-is-now-ap...

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## System.Activities is now APTCA
### Scope
Edge
### Version Introduced
4.5
### Source Analyzer Status
Available
### Change Description
The assembly is marked with the <xref:System.Security.AllowPartiallyTrustedCallersAttribute?displayProperty=name> attribute.
- [ ] Quirked
- [ ] Build-time break
### Recommended Action
Derived classes cannot be marked with the
<xref:System.Security.SecurityCriticalAttribute?displayProperty=name>.
Previously, derived types had to be marked with the
<xref:System.Security.SecurityCriticalAttribute?displayProperty=name>. However,
this change should have no real impact.
### Affected APIs
* Not detectable via API analysis
### Category
Windows Workflow Foundation (WF)
<!-- breaking change id: 20 -->