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It is mold but not harmful. I haven't made vinegar lately but if I remember correctly that may be some sediment rising, depending on what you make the vinegar with. You can ladle out the white stuff. Put the vinegar in a container with a spigot so you can drain off the vinegar without disturbing the top.
It would help if you related your process. You should be covering the top of the jar during fermentation with cheesecloth or coffee filter held on tightly so the bugs, dust can't get in. That should cut down on the growth of the white mold as well.
If the vinegar has a clean, vinegar like smell, it's fine. You will be able to tell if it spoiled because there will be nothing good about it's smell or appearance.
 
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