One possibility was in Microsoft article kb177799 "License Information for This Component Not Found Error" (also Q177799)
Though the original article is gone, an archive is here and here and relevant text reproduced as follows:
SYMPTOMS
When you try to add a control to a form, the following message may
appear:
License information for this component not found. You do not have an
appropriate license to use this functionality in the design
environment.
CAUSE
When a control is installed for run time use only (such as those
installed by an application created with Visual Basic), if the Visual
Basic Development Environment is installed onto the same machine
afterwards and the existing control is of equal or higher version than
that from the CD, the license key for that control is not updated.
RESOLUTION
If the control in question is any of the ones listed below, then find
and double-click on the file Vbctrls.reg on the Visual Basic CD-ROM:
AniBtn32.ocx
Gauge32.ocx
Graph32.ocx
Grid32.ocx
KeySta32.ocx
MSOutl32.ocx
Spin32.ocx
Threed32.ocx
This will update the design-time licenses for these controls.
For Visual Basic 5.0, Vbctrls.reg is found in the \Tools\Controls
folder. For Visual Basic 6.0, it is found on Disk 1 in the
\Common\Tools\Vb\Controls folder, and for Visual Studio 6.0, it is in
the same folder of Disk 3.
The Visual Basic 6.0 CD-ROM also contains these files for the Visual
Basic 5.0 Custom Controls that were discontinued in Visual Basic 6.0:
If the control in question is not among the controls listed above, please do the following:
Locate Regsvr32.exe on your machine. Note its path.
Locate the offending OCX file(s), usually found in the Windows\System folder...
On the Start menu, click Run.
In the Run dialog box, type the following:
<Path to RegSvr32>\REGSVR32.EXE /u <Path to OCX>\OCXFILE.OCX
For example:
C:\Devstudio\VB\REGSVR32.EXE /u C:\Winnt\System32\COMCTL32.OCX
If you are reinstalling an older version of the control, you should delete/remove the .OCX, .OCA and .DEP files so they will be replaced.
Repeat the previous 3 steps for each offending OCX.
On Control Panel, click Add\Remove Programs.
Select Visual Basic, and click Add\Remove.
Click Reinstall when the options (Add\Remove, Remove All, Reinstall) dialog box appears.
Reapply the latest Visual Studio Service Pack